The Timeline page, on a project with many tickets at least, can be slow. It's probably a good idea to only display a few days, maybe 5 and add a link to show more.
Not a bad idea, I'll add links for 7 days, 14 days, 21, etc.
the timeline doesn't work correct. When viewing timeline for 2 weeks, I get results from 18 February 2010 (which isn't two weeks ago), and viewing 4 weeks gives results form October last year
It's working fine. The only reason you're getting older results is because its showing the amount of days given. I'll probably change it to say "days" instead of "weeks".