turn out I had to manually install from manjaro repo the opencl-mesa package… now darktable is much much faster! Thanks to a stranger on the internet replying to a youtube comment I left saying how much slower darktable is that lightroom. Thank you kind stranger. Video here: https://www.youtube.com/watch?v=EZVqd0BJEfs&lc=Ugzi-NUmHZTckjuL27Z4AaABAg.96H1duUdeZc9GbPlSXdNHY
Heh just noticed youtube still has my real name… I guess left over from G+ as I wouldnt have changed it after that. Meh whatever.