OB Class Loops

[Asite06]

Thank you for your great work. The library performs well overall, but there's one issue: the OB class is implemented using for loops, resulting in approximately 20 seconds of runtime. Typically, this isn't a problem, but since I'm attempting to develop a Freqtrade strategy with this library, the backtesting process takes about a day to yield results. I've attempted to use vectorized operations to improve performance, but I haven't succeeded. Could you help vectorize the classes to enhance speed? I would be extremely grateful.