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It shouldn’t be slower and as long as the monitor is displayport (thunderbolt) or HDMI then a ‘apple specific’ monitor if such a thing exists shouldn’t be needed.
is it the BenQ calibration software? i’m an Eizo user myself and did not notice any slowdown with my (intel) MBP and Colornavigator calibration software.
your monitor isn’t even 4k so should not stress the graphics.could be something like software or preferences issues which are notoriously difficult to track down.
Not noticed any issues with C1 or PS with my M1 studio/Eizo CG2730 apart from legacy filters like smart sharpen not being updated (it is now )
My M1 Max MBP is noticeably slower when my external monitor is plugged in. It's a Benq SW2700 which is not new tech (I got it in 2018).
Things like AE and C1 were running much slower when it is plugged in, but I need a good quality monitor for retouching and also editing. Will newer non apple monitors be better or do I need something that is designed specifically to run with the new M1 Macs?