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Wow that does sound strange. I'd suggest enabling debugging on the built EXE, and then you can probe around. Using something like the simple sexy timing probe you should be able to see what steps in your process are slower than in the IDE. The unfortunate thing is it sounds like all processes are just generally slower. I could also suggest trying to see how it performs with only one worker loop (compared to source) but it sounds like the problem gets worst with more loops so this might not tell you much. Maybe you could do the divide and conquer method and start disabling, parts of the code and see when it starts to respond like the source. Very time consuming, but effective for isolating the problem.