many many people on the WOT forums are reporting fps drops this patch
i myself was seeing them but mine wore dropping to around 55-60 fps so was still able to play
if you have recently updated your graphics card driver nvidia here is what to do,
Go to your Nvidia control panel, and under Manage 3D settings, go to global settings and scroll down until you find “Multi display/mixed-GPU acceleration” and set it to “Single Display performance mode” (This setting determines how OpenGL games and applications, which are not all that common, handle rendering when connected to multiple displays and/or if using two or more different types of Nvidia GPUs)
i am now a steady 120ish give or take
