Berat Cakan: codes optimized very well but still backtesting slow.
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EAs : Don't do per tick that you can do per bar, or on open.
If you are waiting for a level, don't reevaluate, wait until price reaches it (or a new bar starts and you recalculate.)
If you are waiting for an order to open or close, only look when OrdersTotal (or MT5 equivalent) has changed.
How to get backtesting faster ? - MT4 - MQL4 programming forum 2017.08.07 -
Indicators: Code it properly so it only recomputes bar zero (after the initial run.)
How to do your lookbacks correctly. 2016.05.11 -
Or, reduce Tools → Options (control+O) → Charts → Max bars in chart to something reasonable (like 1K.)

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Hi there_
I am using custom indicators on my ea and the codes optimized very well but still backtesting slow. I am using 1 core 6 gb ram vps.
I need more power computer ? how is mql5 vps ?