After working on a few Java/JEE projects, your workspace really gets to become fat. I mean, it gets very very slow. This is because you opened and closed a lot of projects with a loooot of resources in it. Also because every time you press that Ctrl+Shift+R, or Ctrl+Shift+O, or Ctrl+T in java or run some free text search, You are loading up eclipse's cache of index. Also JDT slowly keeps a track of it, for Type Hierarchies, Implementations. The easiest way is to open a workspace for every unrelated project. Keep it small. But sometimes, it is not possible. Dependencies. Ease to work with one monolithic workspace (opening and closing projects - yea that's me). For these cases, You could just clean up the .metadata\.plugins\org.eclipse.jdt.core folder in your workspace. If you are feeling even lucky, go ahead, clean up .metadata\.plugins\org.eclipse.core.resources\.history ... a. a. aa. Wait, That folder, contains all that local history of files you have changed - LOCALLY