I know how frustrating that could be. Well, let's see if this might work:
1- Launch the game, and press Ctrl + Alt + Delete, then select Task Manager;
2- Right-click on the game, and select Go to details;
3- Right-click on the game, and select Set Priority, then select Low, after that right-click the game again, and select Set Affinity;
4- Uncheck CPU0, close Task Manager, then return to the game.