I'll let others comment about the "load" of MA3 - which is substantially more than MA2.6.
Suggestion:
If your PC is not really new, I would suggest checking whether the fans are working OK, dust bunnies removed, inlets/outlets not blocked, etc.
In particular, check to see that the CPU fan is actually running. And graphics card fan, if applicable. It's quite possible for the CPU fan to quit running and everything seem OK - until some other application comes along.
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