If the game is very demanding, you may get low frame rate and crash.
However, sometimes you are unable to change priority in Task Manager.
You will receive a message saying Access Denied, or the priority simply wont change.
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This can either happen with all processes on your system or with a certain process on all systems.
Next, I will introduce 3 useful methods to help you fix the priority simply wont change error.
Step 1:see to it youre logged in Admin.

Step 2:Start your program and open theTask Manager.
Step 3:CheckShow processes from all usersto ensure processes are running as Admin.
Step 4:Then right-poke the program and clickSet priority, then change the priority.

Is Task Manager not responding in Windows 10/8/7?
Now get the full solutions to fix Task Manager if you cant open it.
Step 1:TypeUser Account Controlin the Search menu to open theUser Account Control prefs.
Step 2:Set the bar toNever Notifyto turn off the prompts.
Step 1:Reboot your unit.
Step 2:PressF8to boot into Safe Mode before your Windows boots.
Step 3:ChooseSafe Bootand let Windows boot up.
Step 4: have a go at switch the priority in the Task Manager.
if you catch such an error, these methods can be useful and effective for you.