It has been brought to my attention that current CRT shader is not very fast on older hardware.
Could be worth it to import shaders from other projects like DosBox Daum.
I don't think it's about computer specs. On DosBox SVN (Daum version) 99% of shaders work pretty fast on the same machine. (i.e. CRT-geom-curved.fx shader, which IMO is a very good replica of a 90's CRT monitor, runs very fast.)
Originally posted by @Chris12121978 in https://github.com/barotto/IBMulator/issues/44#issuecomment-485453958
It has been brought to my attention that current CRT shader is not very fast on older hardware. Could be worth it to import shaders from other projects like DosBox Daum.