Massive FPS drop since last patch

Issues with the Razer Synapse SDK have resurfaced, so try the steps from this sticky thread: Known Technical Support Issues - #16 by Drakuloth

If that doesn’t resolve it, try removing your display drivers with DDU (Display Driver Uninstaller, a third party program) and then grabbing the latest version again. The error above is a timeout delay of Windows waiting for your GPU to respond, which can sometimes be caused by corrupted drivers.