The current YSlow score for the drupal.org front page is 74 (C). YSlow suggests that we reduce the number of CSS background images using CSS sprites, that we use a Content Delivery Network (CDN) like Akamai for delivering static files, and identifies an Apache configuration issue that affects the Entity Tags or ETags of static files. The problem is that, by default, Apache constructs ETags using attributes that make them unique to a specific server. A stock Apache embeds inode numbers in the ETag which dramatically reduces the odds of the validity test succeeding on web sites with multiple servers; the ETags won't match when a browser gets the original component from server A and later tries to validate that component on server B.
