23 ms·

I think it's likely the impact of the mitigations against Spectre and Meltdown (iMac Pro uses older-generation Xeon W CPUs). And yeah I'll do the usual checks,

• kstrauser 2y ago
  I really don't think it'd be those mitigations. Estimates I've seen floating around estimate it to be a total 15-25% performance hit when heavily loaded. For additional context, last weekend I went around to every old Intel Mac in a medical office to upgrade their OSes and some of the apps on them. None of them were speed demons, but they were all just proportionally slower than my much newer Mx Macs. Regular "small" apps still loaded quickly and were perfectly usable. This is in a busy office where any slowdowns that kept people from working at full speed would be fixed. And just because it works for me doesn't automatically mean it's got to work for you, of course. I'm not going to doubt your experience. It's more that what you're describing is so very different than what I'm seeing that it feels like there's got to be something more at play here.