My Mac Studio M1 Max seems sluggish in certain areas after loading 15.4. YouTube is not working well it hangs and never starts to play or if it does it hangs. It works just fine on the iPad M4 Pro iPadOS 18.4, and the iPhone 16 Pro Max iOS 18.4. In other areas, it just seems slow. I have rebooted, restarted, and so on. Chrome keeps reloading like you are opening it for the first time. It is annoying enough that I am using the Mini PC instead. I had this same problem with the same machine when it first loaded the Sequoia 15.0 it worked itself out eventually. this GMKTech PC with Windows 11 pro is a sweet machine. The only way I can tell the difference on websites is the page control tabs are on the upper right side of the screen. and, of course, different commands. I never thought I would say this but Windows 11 Pro is pretty good.