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What’s next for the Aurelia JavaScript framework

InfoWorld JavaScript - Mon, 01/08/2018 - 03:00

This should be a busy year for Aurelia, a JavaScript client framework that emphasizes use of focused modules. It is being groomed for improvements ranging from server-side rendering to state management.

Developers of the project also have ambitions to improve the platform’s user experience framework, Aurelia UX. A full conversion of Aurelia to TypeScript is being considered as well, although that could happen after 2018.

[ Go deeper at InfoWorld: Beyond jQuery: An expert guide to JavaScript frameworks • The complete guide to Node.js frameworks • The 10 essential JavaScript developer tools • The 6 best JavaScript IDEs and 10 best JavaScript editors. | Keep up with hot topics in programming with InfoWorld’s App Dev Report newsletter. ]

Sponsored by Blue Spire, Aurelia features a collection of open source modules and is intended for developing mobile, desktop, and browser apps. The framework has been forked roughly 600 times in GitHub and has more than 10,000 stars in that venue.

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Categories: Web Technologies

Monitoring unused CSS by unleashing the raw power of the DevTools Protocol

CSS-Tricks - Fri, 01/05/2018 - 12:38

From Johnny's dev blog:

The challenge: Calculate the real percentage of unused CSS

Our goal is to create a script that will measure the percentage of unused CSS of this page. Notice that the user can interact with the page and navigate using the different tabs.

DevTools can be used to measure the amount of unused CSS in the page using the Coverage tab. Notice that the percentage of unused CSS after the page loads is ~55%, but after clicking on each of the tabs, more CSS rules are applied and the percentage drops down to just ~15%.

That's why I'm so skeptical of anything that attempts to measure "unused CSS." This is an incredibly simple demo (all it does is click some tabs) and the amount of unused CSS changes dramatically.

If you are looking for accurate data on how much unused CSS is in your codebase, in an automated fashion, you'll need to visit every single URL on your site and trigger every possible event on every element and continue doing that until things stop changing. Then do that for every possible state a user could be in—in every possible browser.

Here's another incredibly exotic way I've heard of it being done:

  1. Wait a random amount of time after the page loads
  2. Loop through all the selectors in the CSSOM
  3. Put a querySelector on them and see if it finds anything or not
  4. Report those findings back to a central database
  5. Run this for enough time on a random set of visitors (or all visitors) that you're certain is a solid amount of data representing everywhere on your site
  6. Take your set of selectors that never matched anything and add a tiny 1px transparent GIF background image to them
  7. Run that modified CSS for an equal amount of time
  8. Check your server logs to make sure those images were never requested. If they were, you were wrong about that selector being unused, so remove it from the list
  9. And the end of all that, you have a set of selectors in your CSS that are very likely to be unused.

Clever, but highly unlikely that anyone is using either of these methods in a consistent and useful way.

I'm a little scared for tools like Lighthouse that claim to audit your unused CSS telling you to "remove unused rules from stylesheets to reduce unnecessary bytes consumed by network activity." The chances seem dangerously high that someone runs this, finds this so-called unused CSS and deletes it only to discover it wasn't really unused.

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Monitoring unused CSS by unleashing the raw power of the DevTools Protocol is a post from CSS-Tricks

Categories: Web Technologies

`font-size` With All Viewport Units

CSS-Tricks - Fri, 01/05/2018 - 10:39

We've covered fluid type a number of times. This page probably covers it in the best detail. It's a little more complicated than simply using a vw unit to set the font-size since that's far too dramatic. Ideally, the font-size is literally fluid between minimum and maximum values.

Someday there will be min-font-size and max-font-size (probably), but until then, our fluid type implementations will probably need to resort to some @media queries to lock those mins/maxes.


Around a year ago Matt Smith documented a technique I had missed. It calculates font-size using a little bit of vw, a little bit of vh, and a little bit of the smaller of the two...

:root { font-size: calc(1vw + 1vh + .5vmin); }

Of course, it depends on the font and what you are doing with it, but it seems to me this tempers the curve such that you might not really need a min and max.

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`font-size` With All Viewport Units is a post from CSS-Tricks

Categories: Web Technologies

A Round-Up of 2017 Round-Ups

CSS-Tricks - Fri, 01/05/2018 - 07:03

This week marked the beginning of a new year and with it came a slew of excellent write-ups from folks in our industry reflecting on the year past. We thought it would be nice to compile them together for easy reference. If you know of any others that should be on everyone's radar, please leave it in the comments.

Now on to the round-up of round-ups!

Rachel Andrew

Having been wandering the globe talking about CSS Grid for almost five years, Grid finally shipped in browsers in 2017. This was good, as I didn’t really want to be some kind of CSS vapourware lady. I knew Grid was important the first time I read the initial spec. I had no idea how my championing of the specification would change my life, and allow me to get to work with so many interesting people.

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Geri Coady

One of my biggest achievements this year was the release of my second book, Color Accessibility Workflows, published by A Book Apart. I’m hugely grateful for any opportunity to talk about color and how it can impact people in the digital world, and writing for A Book Apart has long been a dream of mine.

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Monica Dinculescu

You can tell I hate writing year in reviews because this one is really, really late. I tend to hate bragging, and I definitely hate introspective and, in particular, I always think I am underperforming (and that’s fine). However, that’s usually not true, and writing a year in review forces me to see the awesome things I did, so even if I did end up underperforming, at least I can learn from that. That’s the whole point of post-mortems, right?

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Sarah Drasner

This year has been a surreal one for me. I’ve had years that were particularly tough, years that trended more cheerfully, but 2017 was unique and bizarre because I felt an immense guilt in my happiness.

I think this might have been the year I found the most personal happiness, but the giant caveat in everything was watching the world divide, watching racism, sexism and hatred rise, and seeing some real damage that incurred on people’s lives around the world.

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Brad Frost

Throughout 2017, when people asked how I was doing, I’d say “Great…for the things I can control.” 2017 was a rough year at a macro level for everybody, and I found myself coping with the state of the world in a number of different ways. But on a personal level, I had a rewarding year full of a lot of work, a lot of travel, and even some major life changes.

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Geoff Graham

It feels kind of weird to include my own round-up, but whatever.

I've typically set goals for myself at the start of each year and followed up on them somewhere towards the end of the year. Unfortunately, the last time I did that out loud was in 2014. I’ve been pretty quiet about my goals and general life updates since then and it’s certainly not for lack of things to write about. So, I’m giving this whole reflection thing the ol’ college go once again.

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Jeremy Keith

Jeremy published 78 blog posts in 2017 (or 6.5 per month as he calculates it) and noted his personal favorites.

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Zach Leatherman

I had an incredibly productive year of side projects, learning, and blog posts—I can attribute almost all of that rediscovered time and energy to quitting Facebook very early in the year. It’s also been amazing to see my daughter grow and learn—she turned two this year and I really love being a dad. We now have our own secret handshake and it’s my favorite thing.

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Ethan Marcotte

And finally, one of the things I’m most proud of is, well, this little website, which I launched hastily just over a year ago. And over the last entirely-too-eventful year, I’ve surprised myself with just how much it helped to be blogging again. Because while the world’s been not-so-lightly smoldering, it felt—and feels—good to put words in a place where I can write, think, and tinker, a place that isn’t Twitter, a place that’s mine.

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Eric Meyer

While this is not so much a reflection on the past year, Eric did mark the new year with a livestream redesign of his personal website—the first design update in 13 years.

My core goal was to make the site, particularly blog posts, more readable and inviting. I think I achieved that, and I hope you agree. The design should be more responsive-friendly than before, and I think all my flex and grid uses are progressively enhanced. I do still need to better optimize my use of images, something I hope to start working on this week.

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Dave Rupert

My big work task this year was building a Pattern Library and it’s exciting to see that work beginning to roll out. The most gratifying aspect is seeing the ultimate Pattern Library thesis proven out: Speed. Pages load faster, CMS integrations are faster, and we can successfully turn out new production pages within a 1-day turnaround.

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David Walsh

David used the new year to think about and plot upcoming goals.

Every turn of the year is a new opportunity to start over, set goals, and renew optimism that time can heal wounds and drive us to change and achieve. For me 2018 is my most important year in a long time; 2018 needs to serve as a turning point for this blog and my career.

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Trent Walton

Dave, Reagan, and I celebrated our 10th official year as Paravel. In addition to some shorter-term projects, we undertook a large-scale pattern library and front-end update that is rolling out in phases this year. We’ve also enjoyed bringing in 6+ collaborators/teams to assist with projects when the need has arisen. I bet we do more of this in 2018—collaborating with friends has been fun.

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Think we'd leave out our own round-up? Of all the site stats Chris shared in this post, this one nicely summed up the action around here in 2017:

We were on a publishing roll though! We published 595 posts, blowing away last year with only 442, the previous record. We also published 50 pages (i.e. snippets/videos/almanac entries) beating 43 last year. Certainly, we're in favor of quality over quantity, but I think this is a healthy publishing pace when our goal is to be read, in a sense, like a magazine.

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A Round-Up of 2017 Round-Ups is a post from CSS-Tricks

Categories: Web Technologies

This Week in Data with Colin Charles 22: CPU vulnerabilities and looking forward to 2018

Planet MySQL - Fri, 01/05/2018 - 03:07

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

Happy New Year. Here’s to 2018 being a great year in the open source database world. What is in store for us? Probably: MySQL 8.0 and MariaDB Server 10.3 as generally available. What will we see in the rest of the space? Clouds? All I know is that we move fast, and it’s going to be fun to see what unfolds.

The biggest news this week may not necessarily be database related; it focused on CPU security vulnerabilities and the potential slowdowns of your servers once the updates are applied. Please do read Meltdown and Spectre: CPU Security Vulnerabilities. Peter Zaitsev himself, got quoted in Bloomberg:

Peter Zaitsev, the co-founder and chief executive officer of Percona, a Raleigh, North Carolina-based company that helps businesses set and manage large computer databases, said that firms running such databases might see a 10 to 20 percent slowdown in performance from the patches being issued. He said this was not enough to cause major disruptions for most applications. He also said that subsequent versions of the patch would likely further reduce any performance impacts.

He also said that in cases where a company has a server completely dedicated to a single application there was likely no need to implement the patch as these machines are not susceptible to the attacks researchers have discovered.

Now that we’re all looking at 2018, I also recommend reading A Look at Ten New Database Systems Released in 2017 – featuring TimescaleDB, Azure Cosmos DB, Spanner, Neptune, YugaByte, Peloton, JanusGraph, Aurora Serverless, TileDB, and Memgraph. Also, don’t forget to read What lies ahead for data in 2018 – interesting thoughts on making graph/time series data easier, data partnerships, machine learning, and a lot more.

  • Percona Toolkit 3.0.6 – now with better support for pt-table-sync and MyRocks, pt-stalk checks the RocksDB status, pt-mysql-summary now expanded to include RocksDB information, and more!
  • MariaDB Server 10.2.12 – improvements in InnoDB, like shutdowns not being blocked by large transaction rollback, and more.
Link List Upcoming appearances
  • FOSDEM 2018 – Brussels, Belgium – February 3-4 2018
  • SCALE16x – Pasadena, California, USA – March 8-11 2018

I look forward to feedback/tips via e-mail at colin.charles@percona.com or on Twitter @bytebot.

Categories: Web Technologies

Finding out the MySQL performance regression due to kernel mitigation for Meltdown CPU vulnerability

Planet MySQL - Thu, 01/04/2018 - 22:06

Update: I included the results for when PCID is disabled, for comparison, as a worse case scenario.

After learning about Meltdown and Spectre, I waited patiently to get a fix from my OS vendor. However, there were several reports of performance impact due to the kernel mitigation- for example on the PostgresQL developers mailing list there was reports of up to 23% throughput loss; Red Hat engineers report a regression range of 1-20%, but setting OLTP systems as the worse type of workload. As it will be highly dependent on the hardware and workload, I decided of doing some test myself for the use cases I need.

My setup

It is similar to that of my previous tests:

Hardware -desktop grade, no Xeon or proper RAID:

  • Intel(R) Core(TM) i7-4790K CPU @ 4.0GHz (x86_64 Quad-core with hyperthreading) with PCID support (disabling pcid with “nopcid” kernel command line will also be tested)
  • 32 GB of RAM
  • Single, desktop-grade, Samsung SSD 850 PRO 512GB

OS and configuration:

  • Debian GNU/Linux 9.3 “Stretch”, comparing kernels:
    • 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3+deb9u1 (no mitigation)
    • 4.9.0-5-amd64 #1 SMP Debian 4.9.65-3+deb9u2 (latest kernel with security updates backported, including pti enabled according to security-announces)
  • datadir formatted as xfs, mounted with noatime option, all on top of LVM
  • MariaDB Server 10.1.30 compiled from source, queried locally through unix socket

The tests performed:

  • The single-thread write with LOAD DATA
  • A read-only sysbench with 8 and 64 threads
The results

LOAD DATA (single thread)

We have been measuring LOAD DATA performance of a single OpenStreetMap table (CSV file) in several previous tests as we detected a regression on some MySQL versions with single-thread write load. I believe it could be a interesting place to start. I tested both the default configuration and another more similar to WMF production:

Load time rows/s Unpatched Kernel, default configuration 229.4±1s 203754 Patched Kernel, default configuration 227.8±2.5s 205185 Patched Kernel, nopcid, default configuration 227.9±1.6s 205099 Unpatched Kernel, WMF configuration 163.5±1s 285878 Patched Kernel, WMF configuration 163.3±1s 286229 Patched Kernel, nopcid, WMF configuration 165.1±1.3s 283108

No meaningful regressions are observed in this case between the default patched and unpatched kernels- the variability is within the measured error. The nopcid could be showing some overhead, but the overhead (around 1%) is barely above the measuring error. The nopcid option is interesting not because the hardware support, but because of the kernel support- backporting it could be a no-option for older distro versions, as Moritz says on the comments.

It is interesting to notice, although offtopic, that while the results with the WMF “optimized” configuration have become better compared to previous years results (due, most likely, to improved CPU and memory resources); the defaults have become worse- a reminder that defaults are not a good metric for comparison.

This is not a surprising result, a single thread is not a real OLTP workload, and more time will be wasted on io waits than the necessary syscalls.


Let’s try with a different workload- let’s use a proper benchmarking tool, create a table and perform point selects with it, with 2 different levels of concurrency- 8 threads and 64 threads:

sysbench --test=oltp --oltp-table-size=1000000 --mysql-db=test --mysql-user=test prepare sysbench --test=oltp --oltp-table-size=1000000 --mysql-db=test --mysql-user=test --max-time=120 --oltp-read-only=on --max-requests=0 --num-threads={8, 64} run

TPS SELECTs/s 95 percentile of latency(ms) Unpatched Kernel, 8 threads 7333±30 100953±1000 1.15±0.05 Patched Kernel, 8 threads 6867±150 96140±2000 1.20±0.01 Patched Kernel, nopcid, 8 threads 6637±20 92915±200 1.27±0.05 Unpatched kernel, 64 threads 7298±50 102176±1000 43.21±0.15 Patched Kernel, 64 threads 6768±40 94747±1000 43.66±0.15 Patched Kernel, nopcid, 64 threads 6648±10 93073±100 43.96±0.10

In this case we can observe around a 4-7% regression in throughput if pcid is enabled. If pcid is disabled, they increase up to 9-10% bad, but not as bad as the warned by some “up to 20%”. If you are in my situation, and upgrade to stretch would be worth to get the pcid support.

Further testing would be required to check at what level of concurrency or what kind of workloads will work better or worse with the extra work for context switch. It will be interesting to measure it with production traffic, too, as some of the above could be nullified when network latencies are added to the mix. Further patches can also change the way mitigation works, plus probably things like having PCID support is helping transparently on all modern hardware.

Have you detected a larger regression? Are you going to patch all your databases right away? Tell me at @jynus.

Categories: Web Technologies

NectarJS to offer JavaScript compilation-as-a-service

InfoWorld JavaScript - Thu, 01/04/2018 - 14:45

Can JavaScript become a universal language for developing for multiple form factors? The inventor of NectarJS, a compiler-as-a-service cloud application now in development, claims NectarJS will make this happen.

Currently in alpha release, NectarJS would have developers code in JavaScript for multiple platforms, including the internet of things, various operating systems, and the WebAssembly portable code format. Web developers could thus become low-level software programmers, claims Seraum, the company behind NectarJS.

[ Go deeper at InfoWorld: Beyond jQuery: An expert guide to JavaScript frameworks • The complete guide to Node.js frameworks • The 10 essential JavaScript developer tools • The 6 best JavaScript IDEs and 10 best JavaScript editors. | Keep up with hot topics in programming with InfoWorld’s App Dev Report newsletter. ] How NectarJS works

NectarJS uses a multistep process:

To read this article in full, please click here

Categories: Web Technologies

Meltdown and Spectre: CPU Security Vulnerabilities

Planet MySQL - Thu, 01/04/2018 - 14:44

In this blog post, we examine the recent revelations about CPU security vulnerabilities.

The beginning of the new year also brings to light fresh and new CPU security vulnerabilities. Today’s big offenders originate on the hardware side – more specifically, the CPU. The reported hardware kernel bugs allow for direct access to data held in the computer/server’s memory, which in turn might leak sensitive data. Some of the most popular CPUs affected by these bugs are Intel, AMD and ARM.

The most important thing to know is that this vulnerability is not exploitable remotely, and requires that someone execute the malicious code locally. However, take extra precaution when running in virtualized environments (see below for more information).

A full overview (including a technical, in-depth explanation) can be found here: https://meltdownattack.com/.

These three CVEs refer to the issues:

Although the problems originate in hardware, you can mitigate the security issues by using updated operating system kernel versions. Patches specific to database servers such as Percona Server for MySQL, Percona Server for MongoDB, Percona XtraDB Cluster and others are unlikely.

Fixes in Various Operating Systems

Fixes and patches are available for Windows and MacOS. Not all major Linux distributions at the time of this post have released patches (though this is expected to evolve rapidly):

Security Impact

As mentioned above, this vulnerability is not exploitable remotely. It requires malicious code to be executed locally. An attacker must have either obtained unprivileged shell access or be able to load malicious code through other applications to be able to access memory from other processes (including MySQL’s memory).

To potentially exploit the vulnerability through MySQL, an attacker theoretically needs to gain access to a MySQL user account that has SUPER privileges. The attacker could then load UDF functions that contain the malicious code in order to access memory from the MySQL Server and other processes.
In MongoDB a similar behavior would need to use eval().

Cloud Providers, Virtualization and Containers

Some hypervisors are affected by this as they might access memory from other virtual machines. Containers are affected as well, as they can share the same kernel space.

More information (source):

Performance Impact

As a general rule, Percona always recommends installing the latest security patches. In this case, however, the decision to immediately apply the patch is complicated by the reported performance impact after doing so. These patches might affect database performance!

RedHat mentions the expected impact to be measurable, and Phoronix.com saw a noticeable hit for both PostgreSQL and Redis.

At this time, Percona does not have conclusive results on how much performance impact you might expect on your databases. We’re working on getting some benchmarks results published shortly. Check back soon!

Categories: Web Technologies

2017 Year in Review at VividCortex

Planet MySQL - Thu, 01/04/2018 - 12:47

It’s easy to observe (pun intended) in the rear-view mirror. Hindsight bias aside, 2017 was a big year for VividCortex and our customers! We shipped lots of features and made tons of progress on the business. Here’s a brief overview of some of our proudest moments from 2017.

Enhanced PostgreSQL support

We love PostgreSQL, and we released lots of enhancements for it! Here’s some of the stuff we did for our PostgreSQL customers:

  • Supported the great work the Postgres community did on version 10 and all its new features
  • Made VividCortex awesome for our customers who use CitusDB
  • Added support to monitor PgBouncer, which nearly everyone who’s using Postgres in a mission-critical environment is using by default
  • Added SQL query analysis to provide that extra level of database-specific insight, so you get help really understanding what your SQL does
  • Added support for collecting and analyzing lots more data. You can now rank, sort, slice-and-dice so many things: Queries, Databases and Verbs by Shared Blocks Hit, Shared Blocks Read, Shared Blocks Dirtied, Shared Blocks Written, Local Blocks Hit, Local Blocks Read, Local Blocks Dirtied, Local Blocks Written, Temp Blocks Read, Temp Blocks Written, Block Read Time and Block Write Time. And that's not all, you can rank and profile Verbs and Users too!
Released Many MongoDB Improvements

We spent a ton of time expanding our support for our MongoDB customers. A few of the many things we improved:

  • Index analysis, a key pain point for MongoDB, which relies heavily on indexes for performance
  • Automatic discovery of the full MongoDB scale-out configuration, including support for discovering and monitoring mongod, mongos, and config servers
  • Auto-discovery of replication sets and clusters
  • A Node Group view to visualize the cluster hierarchy
  • Deep profiling capabilities for missing indexes, locking performance, data size, index size, and looking for blocking and most frequent queries in db.currentOp() -- plus a bunch more!
  • Cursor operations, EXPLAIN, new expert dashboards, and more
  • In-app help documentation tooltips to help you understand all those MongoDB metrics and what they mean


Released Extended Support for Amazon RDS

We added support for enhanced metrics in Amazon RDS, so now you get CloudWatch, host metrics, and tons more detail. This is super helpful when trying to debug black-box behaviors on RDS!

Released Expert Insights

In October we released Expert Insights for PostgreSQL, MongoDB, and MySQL. These features automatically and continually monitor your databases with dozens of rules and checks. They essentially continually test your database’s state and behavior to provide best practice recommendations about configuration, security, and query construction. Now you don’t have to manually review everything, because VividCortex never sleeps!

  Improved Charts and Dashboards

We released a bunch of updates to the Charts section in 2017. KPI dashboards for MongoDB and PostgreSQL are new chart categories with key performance indicator (KPI) metrics preselected by our brainiacs. They show you the most important performance and health information at a glance. Built by experts, so you don’t have to do all that work yourself:


The new "System Resources by Hosts" category of charts plots several hosts on each chart so you can easily spot outliers. In the following screenshot, you can immediately see one of the hosts has much higher CPU utilization than the others:

There’s more. We redesigned Charts and Dashboards for a better experience with hundreds or thousands of hosts: new summarized charts scale to infinity and beyond, and you can make your own custom dashboards. Customize away!

New Funding, SOC-2 Compliance, And More!

In August we closed our $8.5M Series A-1 led by Osage Venture Partners with the participation of Bull City Venture Partners, New Enterprise Associates (NEA), and Battery Ventures. We’re thrilled to have recruited such a great group of investors to help us on our way! We’re using the funding to hire and we’re doubling down on our investments in product improvements.

In December we completed SOC 2 Type I certification. This was a massive effort involving almost everyone in the company. We value our customers and we work hard to keep everyone safe!

The most rewarding and important things we did in 2017 were for our customers. There’s too much to list in detail, but we invite you to read their stories. Here’s a few: Shopify, SendGrid, and DraftKings. If you just want the highlights, here’s a quick video that covers a lot of what our customers say about us.

2017 was a productive year for us. In 2018 we’re looking forward to more of the same: shipping more features for our users, keeping up with all of the database news, and seeing everyone at conferences! Here’s to a great 2018 from all of us at VividCortex. See you there -- and if you haven't experienced VividCortex yet, give it a try!

Categories: Web Technologies

Front-End Performance Checklist

CSS-Tricks - Thu, 01/04/2018 - 12:01

Vitaly Friedman swings wide with a massive list of performance considerations. It's a well-considered mix of old tactics (cutting the mustard, progressive enhancement, etc.) and newer considerations (tree shaking, prefetching, etc.). I like the inclusion of a quick wins section since so much can be done for little effort; it's important to do those things before getting buried in more difficult performance tasks.

Speaking of considering performance, Philip Walton recently dug into what interactive actually means, in a world where we throw around acronyms like TTI:

But what exactly does the term “interactivity” mean?

I think most people reading this article probably know what the word “interactivity” means in general. The problem is, in recent years the word has been given a technical meaning (e.g. in the metric “Time to Interactive” or TTI), and unfortunately the specifics of that meaning are rarely explained.

One reason is that the page depends on JavaScript and that JavaScript hasn't downloaded, parsed, and run yet. That reason is well-trod, but there is another one: the "main thread" might be busy doing other stuff. That is a particularly insidious enemy of performance, so definitely read Philip's article to understand more about that.

Also, if you're into front-end checklists, check out David Dias' Front-End Checklist.

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Categories: Web Technologies

React-Redux-Sass Starter

Echo JS - Thu, 01/04/2018 - 10:54
Categories: Web Technologies

ES6 Promises - Quick Start Guide

Echo JS - Thu, 01/04/2018 - 10:54
Categories: Web Technologies