With a brand new Macbook I was a little surprised by the poor performance of my migrations and seeders.
I managed to get MySql 8.0 working on Docker with experimental features enabled and tried to add the platform but it did not make any difference in performance.
Also, I tried MariaDB which supports ARM already but actually it did not make a huge difference and gives me other issues with mysql dumping.
Someone else running into the same problems on the new 2021 M1 chips?
So in the previous version of Docker I was advised to enable the new Virtualization framework (Experimental Features in settings). This caused MySQL to be really slow.
Conclusion; don't enable the new Virtualization Framework.