i used the Strategy tester of MT4 previously in an intensive matter, and it was always running with almost 100% utilization of the CPUs. Now i am getting at most 20% of the CPU power when running the Backtesting. Am not sure it is related to windows or any update of MT4. But it is now really too too slow. Any Idea? Thanks!
MT4 Strategy Tester is single threaded, not multi threaded like MT5.
So on the PC at which it ran at 100% CPU, you probably only had a Single Core CPU, and now on your other PC you probably have a multi-core CPU, but MT4 Tester will only use one thread no matter how many cores you have.