slow

Eclipse PDT is freezing from time to time

I am usign Eclipse PDT Helios and it sometimes freezes for 2-3 seconds even when working with small PHP files, like 10 rows without any includes in them or any complex statement that may cause a problem while parsing. My machine has more than 3GB RAM and I have setup the HEAP size to 990MB. The CPU is Intel E7500 2.9Ghz. What could be ...