Firstly, make sure you are using the latest version of Noxplayer and the Android app you are running. Second, check if allocated memory for Noxplayer is less than 4000 MB if it is so, increasing it to more than 5000 MB may be helpful. Third, See if VT (virtual technology) is enabled, if not enable it from the BIOS settings. Fourth, try switching to OpenGL graphics mode. Lastly, Disable firewall and Anti-virus.