GPU 100%, fps suddenly low

I’ve been playing Overwatch for just over a year and a half now and up until a few days ago it has always run smoothly, however now when the game is running everything is slowed to a crawl. The frame rate will arbitrarily go from being fine one moment to a standstill the next, sometimes freezing the screen on a single frame for several seconds. I haven’t made any adjustments to my settings or changed anything else in my computer recently. Having read similar issues on the forums I tried deleting relevant folders that might have held corrupted files, with no success. When using the task manager I noticed that the game itself was using 99% of the GPU even on the main menu. I hope that someone can relate/give me some advice on what I might be able to do. Many thanks in advance.

These standard tips can help resolve most Overwatch FPS drops:

Also here are advanced tips I have written in Overwatch’s Tech Support forum that maximize your FPS performance in the game.