Slow import

What does macOS Activity Monitor (found in the Utilities folder) show during an import? Specifically, in Activity Monitor, when you view Window > CPU History and Window > GPU History, which of the following do you see?

A) CPU and GPU usage both fill their graphs (very busy)

B) CPU and GPU usage both don’t fill their graphs (not busy)

C) CPU usage very high, GPU usage low

D) CPU usage very low, GPU usage high

Have you attempted to copy those photos to the desired folders outside of LrC, using Finder, then inside of LrC imported them via Add instead of Copy?

Two things to notice when you do, Does using Finder go slow, does Add not go fast.

Incidentally, the number of photos being imported, is this your normal amount or a large increase from previous?

I am experiencing terribly slow file imports from my SD card, after installing LRC 12.01.

By @chucks23986917

Perhaps the card has gone bad. Perhaps the card reader has gone bad. Experiment to see if either is the case.

Is there a reason you haven't updated to LrC 12.1 (released mid December)?