YSlow for Safari

YSlow analyzes web pages and why they're slow based on Yahoo!'s rules for high performance web sites

Install YSlow

YSlow for Safari is available at Safari Extensions Gallery under Developer category. Unfortunately there is no way to link to YSlow extension on that gallery. Safari users can one-click install directly from the gallery page or alternatively

Install YSlow for Safari Now

Installation Instructions

Click the link above to download YSlow for Safari
Double-click the downloaded yslow.safariextz file
On the popup dialog click Install
Done! YSlow for Safari will show up next to location bar