Victor Coulon Victa

How to make faster scroll effects?

Avoid too many reflows (the browser to recalculate everything)
Use advanced CSS3 for graphic card rendering
Precalculate sizes and positions

Beware of reflows

The reflow appens as many times as there are frames per seconds. It recalculate all positions that change in order to diplay them. Basically, when you scroll you execute a function where you move things between two reflows. But there are functions that triggers reflows such as jQuery offset, scroll... So there are two things to take care about when you dynamically change objects in javascript to avoid too many reflows:

This gist demonstrates how to use Compass magic sprites in combination with HiDPI.

See how it's done

	$base-font-size: 16px;
	$base-line-height: 1.5;

	// this value may vary for each font
	// unitless value relative to 1em
	$cap-height: 0.68;


	@mixin baseline($font-size, $scale: 2) {

	gifify() {
	if [[ -n "$1" ]]; then
	if [[ $2 == '--good' ]]; then
	ffmpeg -i $1 -r 10 -vcodec png out-static-%05d.png
	time convert -verbose +dither -layers Optimize -resize 600x600\> out-static*.png GIF:- \| gifsicle --colors 128 --delay=5 --loop --optimize=3 --multifile - > $1.gif
	rm out-static*.png
	else
	ffmpeg -i $1 -s 600x400 -pix_fmt rgb24 -r 10 -f gif - \| gifsicle --optimize=3 --delay=3 > $1.gif
	fi
	else

	#!/usr/bin/env ruby

	# A quick script to download all your files from CloudApp.
	# To run this just run the script passing your e-mail & password
	# to the script, for example:
	#
	# gem install cloudapp_api
	# ruby cloudapp-export.rb [email protected] mypassword
	#

	var CSSAnimation = (function(window, document, undefined) {
	'use strict';

	function camelCaseEventTypes(prefix) {
	prefix = prefix \|\| '';

	return {
	start: prefix + 'AnimationStart',
	end: prefix + 'AnimationEnd',
	iteration: prefix + 'AnimationIteration'

	@main-font-size: 16px;

	.x-rem (@property, @value) {

	// This is a workaround, inspired by https://github.com/borodean/less-properties
	@px-fallback: @value * @main-font-size;
	-: ~`(function () { return ';@{property}: @{px-fallback}'; }())`;
	-: ~`(function () { return ';@{property}: @{value}rem'; }())`;
	}

	#!/usr/bin/env ruby
	require 'tempfile'
	require 'fileutils'

	# Signals
	trap("SIGINT") { exit }

	# Setup
	TARGET_FOLDER = ARGV[0]
	TARGET_URL = ARGV[1]

	/------------------------------------\
	$Z-INDEXES
	\------------------------------------/

	/**
	* Ordered in the same stacking order as the values define;
	* Highest first/top to lowest last/bottom
	*/

	.foo { z-index: 30; }

	$bootstrap: false !default;
	$scaffold: true !default; // Output .span-n classes?
	$selector-type: if($scaffold, ".", "%") !default;
	$old-ie: false !default;

	$total-columns: 12 !default;
	$gutter: 8px !default;

	$container-width: 100% !default;
	$min-width: 240px !default;