How to get rid of this warning? NSToolbarItem.minSize and NSToolbarItem.maxSize methods are deprecated. I do not set minSize or maxSize, it is Interface Builder that seems to do this. Even if I create completely new interface from scratch, this warning still appears. What is the point of introducing this warning if Apple tools unable to produce correct behaviour?

I have the legacy app that maintain its own thread pool to do cpu intensive work. It uses NSProcessInfo.processInfo.activeProcessorCount to get number cores and max thread pool size. It worked quite fine for Intel-based Macs but for Apple Silicon Macs it does not make much sense to create more threads than there are high-performance cores. How do I get the number of high-performance cores on Apple Silicon Macs?

Is it still possible? If so, what developer has to do to get this permission from Apple? I see some apps use features that does not work when sandbox is enabled, to be specific, accessibility related. Some of those apps are quite new, so it is not about legacy apps.