Tab switching slow in Eclipse on Mac OS X —15 September 2010
The fix:
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Find eclipse.ini file in the Eclipse installation.
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Edit/add the following values:
-Xms256m
-Xmx1024m
-Dosgi.requiredJavaVersion=1.6
The requiredJavaVersion=1.6 is the key, but adjusting the heap settings is probably also a good idea.