@Faucheur13 not really no, 90% of the maps will crash pretty much. BO1 custom maps aren't coded properly (they're old) and therefore cause tons of issues outside of Steam etc
@Faucheur13 most likely you uncapped your FPS or your PC isn't really good. CPU usage doesn't say anything about safety. Even Nvidia had 100% CPU usage issues recently.
What is the current value of com_maxfps in the console? Type it and screenshot it