Rebuilding storage pool - Super slow to log-in?

[westyphoto]

HI all - I started upgrading my DS218+ with two new 4TB drives on Friday. I replaced the first one, which repaired overnight... All fine. I replaced the second drive at lunchtime yesterday - It was still repairing last night.
This morning, logging into DSM is taking almost 10 minutes... and everything is crawling.
Do I just leave it alone for now? Can I force restart when the storage pool is being repaired?

[ed]

You should leave it to finish. You should check, maybe you have mixed EFRX and EFAX drives. https://nascompares.com/answer/how-to-te...d-compare/