@YG_6845271,
- Update to the latest graphics card driver
- Go Nvidia Control Panel > Manage 3D setting > Set the option Power management mode to Prefer maximum performance instead of NVIDIA driver-controlled
- As a workaround, to bypass the graphics card, follow the steps given below:
Set config.pro option graphics to win32_gdi
OR
Set –g:win32_gdi using, press RMB on Shortcut icon of application > Add space and –g:win32_gdi next to *.exe in target path