Looks like Eclipse PDT was getting quite slow on me, it thinks sometimes 10-15 seconds when I switch between files or save one. My current project is not small one, but still…

Looking around for a solutions I found quite easy tip at
http://www.eclipsezone.com/eclipse/forums/t61618.html

In short – I am now running
eclipse.exe -vmargs -Xms256m -Xmx256m -XX:PermSize=64m -XX:MaxPermSize=64m

and my Eclipse is way faster.

Thanks for the tip, Riyad Kalla!