Fork me on GitHub

YSlow for Mobile/Bookmarklet

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

YSlow for Mobile works as a bookmaklet. Users can now run the equivalent of regular YSlow in Mobile browsers as well as any bookmarklet enabled desktop browsers.

Mobile Installation Instructions

Option One - Bookmark This Page

  1. Bookmark this page;
  2. Edit the bookmark URL to remove everything up to and including the hash (“#”). The bookmark URL starts with “javascript:” as shown in the screenshot below.

Editing bookmark on iPhone Safari

Figure 1: Editing bookmark on iPhone Safari

Option Two - Copy & Paste Text

  1. Copy the Bookmarklet text in the input box below: javascript:
  2. Create a new bookmark named YSlow;
  3. Paste the copied text into the new bookmark URL field.

Desktop Bookmarklet Installation Instructions

Bookmarklet is a JavaScript code stored as the URL of a bookmark in a web browser.

To add the YSlow Bookmarklet to a desktop browser*, drag and drop the YSlow button below to your browser’s bookmark bar.


* not all browsers are supported