So it would seem this fix needs to reapplied after every Synapse update because the file path changes. 

C:\Program Files\Razer\RazerAppEngine\app-4.0.406\RazerAppEngine.exe

I’m running the latest GeForce drivers; 566.14

Dude, this is so annoying. The suggested fix doesn’t even work and why is Synapse the only app on my entire PC that can’t deal with adaptive sync? Razer needs to fix this ASAP.

Hmm, fix is working fine for me.

Are you sure you picked the right executable? The exact path changes after each update and so needs to be adjusted. Once you apply the settings, you have to completely close down all Razer/Synapse processes and then relaunch (or a system reboot would do it).

There is an alternate possible fix that worked for me while I was having this problem with various programs including razer. Apparently, the Hardware Accelerated GPU Scheduling in windows can largely be responsible for it. To get there, go to Settings → Display → Graphics → Change default graphic settings → Turn off Hardware Accelerated GPU Scheduling. The default graphic settings may be called something similar instead depending on your version of windows. Also, be aware that some games use this setting for some in-game graphics settings like Upscaling in Monster Hunter Wilds.

Thanks for posting that, it is good to have options. I am a little wary of settings which affect all applications and might reduce system performance overall. This option switches parts of the graphics workload between the CPU and GPU. More info here:

https://devblogs.microsoft.com/directx/hardware-accelerated-gpu-scheduling/