Have you set a manual whitebalance?

Yes, correct. Works as a charm :)
Only downsides: no integrated SD-Slot ans only one USB-C port.

But that’s manageable

I switched from an Mid 2012 13" MBPro to the MacBook Air 2020 with the M1 two days ago.
The old MBPro took about 2 min for running a single image through topas. The MBAir does it’s magic on the same images in less than 20sec. I got it directly from Apple as a refurbished model for less that 1k€

My 8GB RAM is sufficient.

Also using LR-Classing. Amazingly fast.

For the LR-CC-Version I cannot comment.

Biathlon Worldcup in Ruhpolding, Germany.
Lying in the Omega shooting Hilde FENNE from Norway in the evening with my Canon EOS 1D Mk IV and the EF 135 f/2.0