Eclipse tuning

Is there any way to improve performance of Eclipse 3.1.1?

After I installed IntelliJ IDEA 5.02 trial and tried to work on Java project, I found I get accustomed to Eclipse, but at another side IDEA seems to be MUCH faster than Eclipse - it loads faster, opens files faster, performs refactoring faster etc.

I'm using JDK 1.4.2_p7 on 5.4 if has matter

eclipse.ini looks like:

-vmargs
-client
-Xincgc
-Xms64m
-Xmx512m