Preview Generation take 1 hours for 155 RAWs photos

I created a new catalog on my SSD hard disk, import 151 Nikon RAWs photos and the preview generation show it takes an hour for the generation. It is crazily slow. I never experience this before I upgrade from CO20 to CO21.

Here is my hardware info

Model Name: iMac

Model Identifier: iMac18,3

System Version: macOS 11.1 (20C69)

Processor Name: Quad-Core Intel Core i7

Processor Speed: 4.2 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 8 MB

Hyper-Threading Technology: Enabled

Memory: 32 GB

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