Howdy!
The only main performance issue we are investigating right now is Windows 10 when, “spatial sound” feature is disabled. Enabling has shown a lot of promise for many users. This can change and update as we collect data and troubleshoot.
As for Windows 7 and 8.1 users, (Though Windows 10 users can follow these steps as well if disabling the sound effect above did not help with your issue). We would want to collect more information to help troubleshoot, and see what is going on here try the following steps:
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Make sure your Operating System is fully upto date as well as your video drivers, we offer help with how to do this Here.
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Double check your Power Settings for the Operating System and GPU are both set to high performance.
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Try playing with the system in Selective Startup. Make sure you restart the PC to get into this mode.
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Reset the game’s settings, then review our guide on Maximizing system performance for Overwatch.
If the issue continues, please reply back with the following information:
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Copy and paste the contents of your Dxdiag into a reply. Make sure to highlight the dxdiag contents and select the code block icon </>. This will make it easier for us to review.
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Open Overwatch goto: Options → Video → Turn on: DISPLAY PERFORMANCE STATS. Click: ADVANCED PERFORMANCE STATS+ turn them all on.
Once in game when this issue occurs press Shift+Ctrl+N to show your Network Graph. Then take a Screenshot. You can upload this to a site like Imgur.com → Only link the part in bold text, example: https://i.imgur.com/vX7Ksxj.png
Thank you!