Eclipse 3.5 (Cocoa) slowing down irregularly after some time

I'd like to hear, if anyone else encounters the same problems, and doesn't use Google's GWT (2.0) plugins:

Sometimes, my Eclipse 3.5 (Cocoa) slows down after some time of usage (>=30 minutes), so that things like maximizing an editor or moving the splitters becomes unbearably slow (reacting only after several seconds). After an Eclipse restart, everything's fine again.

I'm not running low on memory (neither free RAM, nor memory available to Eclipse - Heap/Stack/PermGenSpace), and my system specs are not too bad.

I know exactly one other person so far, who sees the same problem - but he also uses the GWT plugins. Since these issues appear irregularly, they're hard to track. Before creating an issue on the GWT bug tracker, I'd like to find out, if this also happens for somebody without Google's plugins.

Thanks,

Chris

Edit:

I'm running Snow Leopard 10.6.2, Eclipse 3.5 Cocoa 32-bit.

eclipse.ini:

-startup
../../../plugins/org.eclipse.equinox.launcher_1.0.201.R35x_v20090715.jar
--launcher.library
../../../plugins/org.eclipse.equinox.launcher.cocoa.macosx_1.0.1.R35x_v20090开发者_运维知识库707
-product
org.eclipse.epp.package.jee.product
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
-vmargs
-Dosgi.requiredJavaVersion=1.6
-XstartOnFirstThread
-Dorg.eclipse.swt.internal.carbon.smallFonts
-XX:MaxPermSize=280m
-Xdock:icon=../Resources/Eclipse.icns
-Xms54m
-Xmx560m

A good eclipse.ini can help.
But as mentioned in "Horrible eclipse performance on macbook pro running 10.5.8" (which kind of illustrate the fact that performance issue can happen with Galileo without GWT), it can depend on the OS version (Snow Leopard or Leopard).

I have macbook with osx 10.6.3 Eclipse 3.5.2

I develop gwt 2.0.3 + ext-gwt 2.1.3.

I have noticed that suddenly a part of the project slows down. I mean, while before loading the screen was 2-5 sec in dev mode, suddenly increased to a minute or two (?????).

I remember, that earlier, I have re-installed eclipse, but that did not work (????), and when created a new workspace, and moved the project there, suddenly the slowing was gone.

So, I did the same now also.

I don't know the exact reason / solution. However, under the workspace there is a folder ".metadata/.plugins" in there there are lot's of folders. In the "org.eclipse.core.resources" / ".projects" you have for each project you got in your workspace a folder.

Noticed that when I have copied here the project-folder of the same project, created in other workspace, the slowing was gone.

So, eventually the solution is simple: to delete the project from the workspace, but only from the "Package explorer" - that actually removes the folder belonging to the removed project from the above mentioned folder (".metadata/.plugins/org.eclipse.core.resources/.projects/"), while keeping the project files at their location (you should make a backup of it just for sure :) ), and than importing it back.

Voila!

It works fine again.