Devimon :
Checking tested benchmarks of Overwatch on Medium should run at least 100 FPS based on userbenchmark.com but it's getting around 20, while I know it's a budget card I don't think it's performing to what it can do.
Ok lets see if we can figure out the issue then.
1. Check to make sure drivers are up to date. If the drivers are not up to date, you will see lower performance.
2. Click Windows Key + X and go to Event viewer. Please click on windows logs, then system and send a screenshot.
3. This probably won't do much good, but if you click the Windows Key + X, then open an admin level command prompt, then enter sfc /scannow, it can check for any errors in the actual system. This can never do anything but good, so it's worth a shot.
4. Also, Please send a link to your userbenchmark.com score.