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Classic taking a long time to load after external drive reconnected.

Jan 20, 2018
Lightroom Experience
Lightroom Version
Cloud Service
Lightroom Version
Lightroom Classic version: 8.4.1
Operating System
Windows 10
I've recently returned to using Classic so don't remember this being a problem in the past. My images are held on an external drive and I often edit on my laptop with the drive disconnected - Classic opens quickly on these occasions. When I do reconnect the drive and load Classic for the first time it can take up to 10 minutes to open - showing as unresposive in the top bar (Windows 10). Subsequent Classic opens with the drive still connected take seconds. Is this normal or is there a way to speed things up? Catalogue contains around 6000 images.
May 12, 2011
Lightroom Experience
Lightroom Version
I would try "white-listing" your image folders in your anti-virus software and see if that makes a difference.