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I want to say something like:

Using APC is great advice. Performance increases a lot when you use it. (100 to 1 on my tests)

Should I say "on my tests" or "in my tests"?

Are any of those wrong? Do those mean the same?

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up vote 4 down vote accepted

On my tests or on tests refers to a written examination. For example, a student who just took a history exam might say:

I did well on my test today.

In my tests or in tests refers more to an actual series of tests which are run on something. So, if you are running a bunch of test cases on a new Java program, and your program passes all of them, you might say:

The program did well in my tests.

I think your context is more of the second type, so I would suggest using in my tests.

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