The best thing you can do to relieve stress on the CPU is to not run anything else while you play.Īside from a possible issue with hardware, another possibility, if you've been playing in an existing save, is that the addition of the Pets EP is overloading the game. Still, the fact that you played without trouble until you installed Pets means it's worth considering.
Many people on similar hardware to yours struggle to run it, although graphics glitches are much more common than issues with processor tasks. While your hardware is fine for the base game and some expansions (and all stuff packs), Pets is the most demanding pack of all.