Figure 2
From: Using caching and optimization techniques to improve performance of the Ensembl website
YSlow analysis of Ensembl home page before changes. Combined screenshots of YSlow in the Firebug window, showing the 'Performance' and 'Stats' displays respectively. On the left are the factors assessed by YSlow, with a score next to each; the overall score (F) and percentage (46%) are shown at the top of the column. On the right is a table of files downloaded for the page, with file sizes and HTTP request totals. Note how all 28 requests were repeated, even though browser caching of JavaScript and images meant that fewer kilobytes of data were actually downloaded.