Found this great post on Pro Blog Design. If you are not changing themes often, this is a great tip.. to delete dynamic tags from you theme, to improve server load.
Some day I will do a speedtest on this 
LikeThis time I decided to check out the different contact forms plugins for WordPress. Some of them are just simple contact forms where you have no options for customization, and others lets you build your own forms from scratch.
Read MoreThis time I have decided to speedtest social plugins.. you know, the ones that lists small icons for you to bookmark your post or page on different social websites.
Read MoreI just did a quick speedtest between inserting a photo from flickr vs using a photo uploaded to the local WP Media Gallery.
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Speed up your postview using paginated comments
If you have a post with a lot of comments, surely it must be some speed gain from just showing, say ten at the time? To test this I installed the Paginated Comments plugin by James Maurer and created a test post with 12 comments. I configured the plugin to show only 10 comments (this is in fact the default setting), and started testing.