I can attest to the Mac Recording although this is a dedicated recording machine with nothing else running on it.
Would be interested in what Yann has but here are my specs:
I have a brand new 21″ iMac/3.6Ghz i7/16GB Ram/512GB SSD
Logic Pro X 10.4.2
TrippLite USB 2.0 A-B with Ferrite Cores (TrippLite USB 2.0 A-B cable
Very happy with results but I haven’t stressed tested it yet. Most I’ve gotten is 14 tracks for about 17 minutes. No Issues. Will be testing out at church event with 22 channels for about an hour. I’ll report back on results.