Lightroom Classic 11.1 on iMac Big Sur 11.6.4 extremely slow and lags

[Shipp]

In the last week or so LR has been extremely slow. Everything has a lag and today there is up to a 10 second delay when switching to crop tool.

Eg: Grid view /select an image / R for crop tool / 5-10 second wait for tool to appear. This should happen instantaneously. Even if it is an image that I have just cropped when I go back to it it is no better.

It's really bad and I am not sure how to isolate the problem to see if it's my iMac. It's almost unusable.

I'm not prepared to install the recent update because I've heard that it is not stable enough yet.

Thanks for any insight.

Lightroom Classic version: 11.1 [ 202112022200-7fd1f998 ]
License: Creative Cloud
Language setting: en-AU
Operating system: Mac OS 11
Version: 11.6.4 [20G417]
Application architecture: x64
Logical processor count: 20
Processor speed: 3.6GHz
SqLite Version: 3.36.0
Built-in memory: 131,072.0 MB
Real memory available to Lightroom: 131,072.0 MB
Real memory used by Lightroom: 25,775.6 MB (19.6%)
Virtual memory used by Lightroom: 48,897.1 MB
Memory cache size: 14,162.6MB
Internal Camera Raw version: 14.1 [ 993 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 3032MB / 65535MB (4%)
Camera Raw real memory: 3104MB / 131072MB (2%)
Displays: 1) 5120x2880

Graphics Processor Info:
Metal: AMD Radeon Pro 5700

[Axel Matt]

Try resetting the preferences of Lightroom Classic:  https://helpx.adobe.com/lightroom-classic/help/setting-preferences-lightroom.html

Backup your preferences prior to resetting the preferences: 

https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html

There's also an update to LR 11.2 available. Please install this update and check again.