All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent| /* bling.js */ | |
| window.$ = document.querySelectorAll.bind(document); | |
| Node.prototype.on = window.on = function (name, fn) { | |
| this.addEventListener(name, fn); | |
| }; | |
| NodeList.prototype.__proto__ = Array.prototype; |
When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:
const Article = require('../../../../app/models/article');Those suck for maintenance and they're ugly.
| Latency Comparison Numbers (~2012) | |
| ---------------------------------- | |
| L1 cache reference 0.5 ns | |
| Branch mispredict 5 ns | |
| L2 cache reference 7 ns 14x L1 cache | |
| Mutex lock/unlock 25 ns | |
| Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
| Compress 1K bytes with Zippy 3,000 ns 3 us | |
| Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
| Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
| /* | |
| * This work is free. You can redistribute it and/or modify it under the | |
| * terms of the Do What The Fuck You Want To Public License, Version 2, | |
| * as published by Sam Hocevar. See the COPYING file for more details. | |
| */ | |
| /* | |
| * Easing Functions - inspired from http://gizma.com/easing/ | |
| * only considering the t value for the range [0, 1] => [0, 1] | |
| */ | |
| EasingFunctions = { |
