Eclipse Galileo 3.5.1 Index Problems

After a while working with eclipse Galileo SR1 the startup of the IDE slows down. Beside this I frequently got an error like that:

Class file name must end with .class

To fix this I've done the following:

1. Close Eclipse
2. Delete /.metadata/.plugins/org.eclipse.jdt.core/*.index
3. Delete /.metadata/.plugins/org.eclipse.jdt.core/savedIndexNames.txt
4. Start Eclipse again

The eclipse bug list mentioned the behaviour in defect 286379 fixed for Milestone 3.6 M3.