Ditto to all that has been said here. EVERYTHING is SO much slower since upgrading to 1.7.
At first, I thought it was my settings - but I made sure they were set the same as I had them in 1.6
Then I thought there was an issue trying to roundtrip into Affinity from Capture One as is part of my workflow - nope, all settings the same.
Not sure if it's an issue with 1.7 dancing with the graphics or memory, but either way - 1.7 is dang slow and I will not be using it until this gets cleared up.
Thankfully I was able to go back to 1.6 so I can keep getting my work done.
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So... turning off Metal compute acceleration and then restarting seems to be the trick. For now, 1.7 seems just as quick as 1.6 ...
I have not yet tried every tool or persona yet, but so far so good.