Lightroom Classic totally slow macOS Catalina 10.15.1

Lightroom totally slower image construction
My system components:
iMac (Retina 5K, 27 inches, 2019)
Catalina 10.15.1 (19B88
3.7GHz 6-Core Intel Core i5
40 GB 2667 MHz DDR4
Radeon Pro 580X 8GB.
Lightroom starts normally.
 The scrolling in the images in the library mode (magnifying glass (E)) is halting slower image construction, not liquid.
 Scrolling through images in library mode (Full Page Preview (f)) is halting, not even. Image construction 3-4 sec. A liquid work not possible.
These errors always occur even after several reboots.
In developing mode, the tools work so far without any problems.
No problems in Photoshop, Bridge, and Apple Photo. Even in the bridge fluid work in the full page preview.
No other programs except Apple's own on the calculator.
On my old Mac with Mojave (27 ", late 2013), 3.2GHz Intel Core i5, NVIDIA GeForce GT 755M 1GB and 24GB of RAM, everything is much faster (less than a second image build).

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