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dll multithreading

After the last unsolved mystery of MT4 tester peculiarities here comes the next. Wonder if forum gurus could take a look and give their wise opinions. After noticing some promising posts and links here on FFT and SSA and Alglib I decided to try myself as well. So, I integrated Alglib to my dll. Got

optimizing an expert, profiling the time spent

I've developed an expert which I have tried to optimize as much I can to allow as accurate backtesting as possible. But now I realize that much of the overall time spent is actually spent between returning from my expert and before I get the next tick. I'm using M1, backtesting 10y. I'm recording