Perform explicit garbage collection after every request.
Perform explicit garbage collection after every request.

Though there's for sure a performance cost, this dramatically reduces the memory consumption. See #6614 for details.

git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@6593 af82e41b-90c4-0310-8c96-b1721e28e2e2

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