As you can see in the clip below, my framerate is capped around 60fps when I’m alive, but as soon as I die (or spectate others), it more than doubles. I’ve tried vsync on and off, I’ve tried fullscreen and borderless windowed. I’ve tried playing with the framerate limit setting. In this clip it’s set to “display based” and my monitor is running at 165hz. You can see that when I die, my framerate jumps to around the refresh rate of my monitor.
UPDATE: uninstalling razer synapse fixed it
Hey commandlion,
Thanks for the follow-up with the solution you found! Glad it worked out in the end and hopefully this can help others as well with similar issues.
Thank you. Had the same issue.
I had the same issue as well, I fixed it by disabling the overwatch rgb integration through chroma connect on the connect tab in synapse. You don’t have to uninstall synapse to fix it 
Since a couple of older threads about a very similar issue got necro’d, I just wanted to add this resource here in case anyone else runs in to issues with this: