Eclipse / PDT Performance

Problem: Slow startup / indexing or much disk-space used

Solution: go to workspace/.metadata/plugins/org.eclipse.dltk.core.index.sql.h2 and delete the *.db files.
These are cache files which are rebuilt upon the next eclipse startup. Sometimes the are corrupted.

Reference: http://www.nwiresoftware.com/blogs/nwire/2010/09/five-tips-speeding-eclipse-pdt-and-nwire