Hi, we have been discussing display drivers here …
The latest Nvidia driver has further optimisations for your GPU.
Can you try uninstalling your current display drivers, use the DDU driver uninstaller tool following these instructions to ensure you have the cleanest environment for installing your drivers. The instructions are here …
The link to DDU tool is here too. Make sure that Windows does not try to roll back your display drivers during your re-install. I get much better performance than you on an old computer, there is definitely something awry on your system. I re-installed my sound drivers last night because I had lost a lot of performance since this Japan update. I have now regained that performance.