Hello, I have the same behaviour on my macbook pro (mid-2014 / 2,5 GHz Intel Core i7 quatre cœurs / 16 Go 1600 MHz DDR3 / Intel Iris Pro 1536 Mo).
Preview, copy/paste, all about viewing, moving, images is very very slow with macOs 11. No matter the format (jpg, jpeg, png, gif, ...).
I'm a designer working all the day with images .... please, help !
Thanks.
SandeeGDA
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