On the CFEClipse mailing list today, Sonny Savage posted a link to Eclipse performance settings. I thought I would repost the link for others. Have a look at the Performance Settings for Eclipse.ini
Also, for posterity, the CFEclipse Wiki has other interesting articles such as:
Installing RDS support
Line Numbers (a common question)
Restoring Deleted Files
The Preference Pane
If you use eclipse, you owe it to yourself to read over the Table of Contents for the CFEclipse Wiki.