todays bird
❣ Chile in a Photography ❣
#extradirty
Aqua Utopia｜海の底で記憶を紡ぐ
$LAYYYTER
EXPECTATIONS
Kaledo Art
"I'm Dorothy Gale from Kansas"
KIROKAZE
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art blog(derogatory)
Product Placement
trying on a metaphor
macklin celebrini has autism
pixel skylines
Three Goblin Art
hello vonnie
Stranger Things
if i look back, i am lost
Jules of Nature
seen from United States
seen from United States
seen from Russia
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@rohannog
Resource timing API to be turned on by default in Firefox 35
Some good news to start the year. The Resource Timing API will be turned on by default in Firefox 35, due for release in January 2015. You can also have a look at the other changes in Firefox 35.
Combining A5 pages in A4 pages using PDFjam
I've been using PDFtk to deal with PDFs for quite some time now and it has proved to be extremely useful. However, I recently needed to combine some PDFs with A5 pages to A4 pages to make printing simple and predictable. I couldn't find a way to do this on PDFtk, but I did come across PDFjam. PDFjam is built on top of pdfLaTeX, and includes a bunch of useful scripts. The one I was interested in was pdfnup.
The command I used to get the job done was:
pdfnup a5.pdf --nup 1x2 --scale 1.0 --no-landscape --outfile a4.pdf
Introduction
Back in 1979, AT&T released a lightweight database engine written by Ken Thompson, called DBM (http://en.wikipedia.org/wiki/Dbm). In 1987 Ozan Yigit created a work-alike version, SDBM, that he released to the public domain.
The DBM family of databases has been quietly...
perfmap to visualize slow images
The perfmap bookmarklet is an excellent way to visualize which images are slow on a page. It runs on ResourceTiming, so works only on Chrome and IE.
ResourceTiming lands in Firefox 31
Great news! ResourceTiming has landed in the beta version of Firefox 31. It's not turned on by default, though. You can turn it on by going into about:config and setting dom.enable_resource_timing to true.
You can download the beta version here. And if you're interested, you can check out the bug too.
Great news! iOS 8 app developers can use the Nitro JS engine used in Safari if they use WKWebView to open web pages inside apps. Should improve JS performance significantly.
The smile of a loved one. Your childhood blanket. A handsome bodyguard to take you in his arms. “Security” can mean a lot of things in this crazy life, but nothing says “security” like Tumblr’s two-factor authentication. It’s available as an option in your Settings page as of right now.
You know how you need two keys to launch a nuclear missile? Two-factor authentication works like that. One key is your password, the other key is your cellular phone, and you need both to access your Tumblr Dashboard.
Keep your Dashboard safe and secure, like you do with your nuclear missile. Learn more about two-factor authentication today.
On Domain sharding
The good
A few years ago around the time of IE 6, most browsers allowed only 2 parallel requests to a single domain. This was a problem for sites that stored multiple JS, CSS and image files on a single domain (See [1]). Along came domain sharding to the rescue. Now, you could use multiple domains while still storing everything in the same place.
The bad
However, using multiple domains means a new connection has to be made to each of these domains, which increases latency. Also, all modern browsers support 6 connections per domain. So, you shouldn't be using too many shards. From [2] and [3], 2 seems to be an optimum number.
Additionally, too many shards tends to increase network congestion in the browser as described in [4]
The ugly
Recent developments have further increased the costs of these new connections. They are:
Mobile traffic: Making an extra connection from a cellphone is very expensive and adds significantly to the latency of the page [5]
SPDY: SPDY works best when several components are loaded over a single connection. Sharding negates the advantages of SPDY [6]
SSL: SSL connections are very expensive due to the handshake and Certificate verification.
In summary, domain sharding is still useful, but it cannot be used as a big hammer. 2 domains seems to be ideal, but do test with your page and if possible, a bucket of real-world users.
Links:
[1] Sharding Dominant Domains by Steve Souders [2] Reducing Domain Sharding by Jonathan Klein [3] Domain Sharding revisited by Steve Souders [4] Network Congestion and Web Browsing by William Chan [5] Why Domain Sharding is Bad News for Mobile Performance and Users by Peter McLachlan [6] SPDY best practices by Chromium dev team
The hover effects on Amazon’s big ‘ole “Shop by Department” mega dropdown are super fast. Look’it how quick each submenu fills in as your mouse moves down the list:
It’s instant. I got nerd sniped by this. Most dropdown menus have to include a bit of a delay when activating submenus....
Excellent heursitic for preloading menus
Mojito Pipeline
Rendering views for a web app that has less than trivial backends can quickly become problematic as the app may end up holding onto resources while waiting for the full response from all backends. This can become a strategic pain point that monopolizes memory and blocks...
Implementing first-byte flush and page pipelining in Mojito
