Welcome to the Lightroom Community. We're here to help.
Where are you importing images from? From an internal drive or an external drive? If you are using Copy, Move, or Copy as DNG, what is the destination of the import? How many images are you trying to import at once?
What type of preview are you creating while importing images in File Handling?
Could you please share a screenshot of the import settings you are using? Have you tried any troubleshooting steps?
Try the import operation with the following suggestions:
Copy images on the internal drive manually using the File browser & use Add while importing images.
Disconnect any mobile devices & additional peripherals.
Try using embedded & sidecar or minimal when importing images.