If you recently installed OS 26 then Tahoe may take 24-48 hours to re-index everything during which time performance may be affected.
If this is a new machine did you transfer all the software from your old machine ? If so it may be worth deleting PL9 and re-installing, there may be some internal setting that thinks you are still running on a slower device.
Mac mini 32gb. Tahoe. It’s only laggy if I make adjustments when AI masks have been applied. Otherwise, it is as fast or faster than PL8. There must be an issue that’s slowing it down.
well that makes me slightly hopeful that my M1 might manage it if they update the software. if an M4 struggles there is no point in updating hardware for me as it must be the program that is ineffecient. i realise i am on the lowest spec supported but it is painfully slow if using masks - but i really like the AI masks but i am not going to upgrade my computer at moment so will have to stick to PL8.