If your graphics card or internal graphics chipset are struggling, you’ll need to think about upgrading your graphics card, as well as consider a higher-quality monitor that supports higher resolutions and refresh rates.
You can only push your system resolution as far as the hardware supports it, however.
If your graphics card or internal graphics chipset are capable of supporting higher screen resolutions, benchmark software like Novabench will give you further details on how far you can raise it without impacting on your overall system performance.
