14 Steps - Importancia de las reglas YSlow

Rule Name	Rule Id	Default weight
Make fewer HTTP requests	ynumreq	8
Use a CDN	ycdn	6
Add an Expires header	yexpires	10
Compress components	ycompress	8
Put CSS at top	ycsstop	4
Put Javascript at the bottom	yjsbottom	4
Avoid CSS expression	yexpressions	3
Make JS and CSS external	yexternal	4
Reduce DNS lookups	ydns	3
Minify JS and CSS	yminify	4
Avoid redirects	yredirects	4
Remove duplicate JS and CSS	ydupes	4
Configure ETags	yetags	2
Make Ajax cacheable	yxhr	5
Use GET for AJAX requests	yxhrmethod	5
Reduce the Number of DOM elements	ymindom	5
No 404s	yno404	5
Reduce Cookie Size	ymincookie	5
Use Cookie-free Domains	ycookiefree	5
Avoid filters	ynofilter	5
Don't Scale Images in HTML	yimgnoscale	5
Make favicon Small and Cacheable	yfavicon	5