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NinjaTrader custom indicator problem with multiple data series - freezing
All right, folks - seems the mystery is resolved (at least I hope so). A friend of mine who owns a NinjaTrader license contacted them in my behalf describing the problem. They didn't give a solution, but suggested that the problem is supposedly because of intensive logging. In fact, NinjaTrader documentation has a mentioning of this issue, as it turned out.
I'd hardly call once a sec logging too intensive, so I did some tests and found out that the system rapidly slows down when there are many logs in the Log window. I suppose, when the .NET grid used in the Log window has too many lines it doesn't perform well. So, it's not the frequency that matters, but the quantity.
The lesson I leaned for myself - clean your logs periodically, if you're using log messages and running the system for a prolonged period of time.