100% Disk Usage When Backtesting Custom Pairs

 
Past few days I have been optimization backtesting on multiple custom pairs, then I import my like 6th pair, same process as always, and suddenly out of nowhere I am getting 100% disk usage making the backtest and everything on my pc super slow. What changed? I reset my bios for my OC but that is the only thing I can think of that changed. That should be unrelated to MT5, my cpu speeds and every are the same as before. The previous pairs that are already imported also now backtest with 100% disk usage when previously they did not. Memory usage 21.2/32. ***
 

1) install process hacker

2) click on "name" column header with right click

3) select "choose columns"

4) add "IO total rate" item from left list to right list

5) click OK

6) click on "IO total rate" column to order processes by IO rate

7) if need help with process paste here process name and any possible details about file