Ads, widgets, and analytics are a major cause for slow web sites. P3PC is a project focused on analyzing the performance of 3rd party content. The goal is to find the key wins to evangelize to make 3rd party content faster.

The table below summarizes my findings. Click on the links to read the detailed analysis of each snippet. As I do new analyses I'll add them to this table. You can leave suggestions for other 3rd party content to investigate on my original P3PC blog post.

You can help out this project by clicking on the Compare button and measuring how long these snippets take to load in your browser.

Compare
snippet
blog post
impact on page Page Speed YSlow doc.
write
total reqs total xfer size JS ungzip DOM elems median Δ load time
Digg widget big 90 84 y 9 52 kB 107 kB 84 482 ms
Facebook Sharer small 90 92 n 5 8 kB 7 kB 15 183 ms
Google Analytics small 91 99 n 2 18 kB 24 kB 2 27 ms
BuySellAds* small 81 92 n 3 7 kB 14 kB 9 22 ms
Google AdSense* big 87 84 y 8 41 kB 76 kB 9 89 ms
ValueClick* med 89 98 y 3 2 kB 1 kB 1 na**
Quantcast small 93 98 n 2 3 kB 3 kB 2 89 ms
Collective Media* big 86 90 y 6 8 kB 9 kB 7 na**
Glam Media* big 89 83 y 11 68 kB 63 kB 7 na**
* Stats for ads only include the ad framework and not any ad content.
** It's not possible to gather timing stats for snippets with live ads.
column definitions

Leave a comment on the related P3PC blog post.