Very slow Lightroom Classic 11 on MacBook with M1

[Egor5CD8]

Hi! I have BIG troubles with my LRC after update from 10 to 11. It works very slow and doesn't make preview. I reinstalled it and nothing changed. 

Does anyone know how to fix this?

Lightroom Classic version: 11.0 [ 202110120910-0bccc70d ]
License: Creative Cloud
Language setting: en
Operating system: Mac OS 11
Version: 11.6.1 [20G224]
Application architecture: arm64
Logical processor count: 8
Processor speed: NA
SqLite Version: 3.36.0
Built-in memory: 16 384,0 MB
Real memory available to Lightroom: 16 384,0 MB
Real memory used by Lightroom: 2 015,5 MB (12,3%)
Virtual memory used by Lightroom: 404 905,6 MB
Memory cache size: 704,0MB
Internal Camera Raw version: 14.0 [ 950 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 259MB / 8191MB (3%)
Camera Raw real memory: 260MB / 16384MB (1%)
Displays: 1) 2880x1800

Graphics Processor Info:
Metal: Apple M1

[Ian Lyons]

The previews maybe corrupt. Suggest you quit LrC, delete the previews-lrdata container, relaunch and choose 'Build Standard-sized Previews' from Library>Previews menu.

[Michael Czeiszperger]

I'm having exactly the same problems.   We were promised a great speed increase, and instead we can't even browse photos!

As I try to even look at my catalog all of the previews are blank, and then 10 seconds later the screen catches up.  It would take forever just to find a photo.  

This is a huge slowdown from the performance of my six year old Macbook Pro and Lightroom Classic 10.

[Egor5CD8]

I deleted *preview file in Lightroom Catalog folder and it helped me. Seems this file was corrupt