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Strategy Tester is SLOW all of a sudden

Dear all, Strategy testing with reasonable enough while testing specially when I am using open price only on M1 time frame, but all of a sudden it became too too slow while testing specially when I use the visualization mode, any one knows why ? I didn't change anything in its setting

Change of Market Exceution Mode

Hello all, I am new to mql in general but I have experience with c/c++ programming, I am trying a demo account using mql5 and sometime I have No Price returns from OrderSendAsync() function , I checked the SYMBOL_TRADE_EXEMODE using SymbolInfoInteger and return SYMBOL_TRADE_EXECUTION_INSTANT while