The laptop uses the built-in 500 GB APFS boot drive. All my data (including the Photos Library) are on several Thunderbolt external spinning disks formatted as Mac OS Extended (journaled). The iMac has a 1TB internal flash boot drive (APFS). My library has 55k photos and all galleries are “smart” - using keywords (probably ~1000 galleries). I have cloned a copy of the Photos library to my 2020 M1 MacBook Pro and the app lunches instantly and responds with lightening speed - incredible performance! My laptop has 16 GB of RAM and my iMac Pro has 32 GB. This never happened with previous versions of the macOS, but I’m also not certain these problems coincided exactly with the macOS upgrade. Things usually improve after using the app for 30 minutes or so, but it is basically unusable for extended periods of time. It may also take a few minutes to launch. It will frequently take several minutes to display a new photo gallery while switching from one gallery to another (not always). Photos App slow on 2017 iMac Pro after upgrade OS to Big Sur (macOS 11) I upgraded to macOS 11 a few months ago and now I typically experience MAJOR slowdowns while using the Photos app.
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