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Auto-Stack By Capture Time is extremely slow in my LR 9.3 but is nearly instantaneous in LR 8.2.1.
Details:
In LR 9.3 / Mac OS 10.15.5, I selected 1185 photos and did Photo > Stacking > Auto-Stack By Capture Time. I got the spinning beach ball for over two minutes and LR was unresponsive before the dialog finally showed how many photos would be stacked:
In LR 8.2.1, I selected mostly the same photos (1170), and Auto-Stack instantaneously showed me how many photos would be stacked, with no spinning beach ball.
Something broke since LR 8.2.1. Auto-Stack should be just a simple sort and linear scan of the capture times of the selected photos, so the behavior in LR 9.3 is clearly a bug.
See here for the original report by another user on Windows:
https://community.adobe.com/t5/lightroom-classic/auto-stack-by-capture-time-causes-lightroom-classic...