There is no slow down, fix your code.
If you want to argue you will need strong arguments and evidence.
I am testing 3.5 years using OHLC 1 minutes with a complex multisymbols EA, it takes 2 minutes 30 max (my computer is 3 years old) and this time is unchanged since early 2021.
Hi Alain
I don't judge the complexity of the code I just make a comparison.
In the past it was much faster up to 8 times faster, now it is very slow and this does not give the possibility to do anything more.
Manuele
Hello everybody,
Well I found the problem!
If I leave the "Strategy tester visualization" window open, the time goes from 8 min to 1:45, which was not the case in previous builds.
Still it was a great relief.
Thank you
Manuele

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Hello everybody,
I wanted to inform everyone and get feedback on the backtesting topic.
Now with the latest updates the simulation has gotten super slow.
I went through a 4 year simulation, from 15 minutes to 1:45! This using option "OHLC 1 minutes".
So now the simulation is impossible !!!
I don't know exactly which Bild from but unfortunately it is!
Could you let us know why you have slowed down the backtesting times so much?
Thanks you in advance
Manuele