Reduced test run time

Open Christoph Reichenbach requested to merge reduced-test-run-time into master

I've reduced the time limit for the jmh tests. They can still take up to 3s each, I think-- still not great for a unit test, but I found the run times much more palatable than before (as in, the test suite runs through in less than two minutes on the machine that I tried). Feel free to merge and/or adapt.

I also added a parameter for setting collection size, since I thought that might be related, but ended up not using that; feel free to adapt.

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