I was considering an XPS and read through the Dell subreddits. People were constantly complaining how their machine was throttled and even opened it up to apply

I was considering an XPS and read through the Dell subreddits. People were constantly complaining how their machine was throttled and even opened it up to apply better cooling paste, undervolted it and so on. I have a hard time believing that one company is doing miracle work in a small and light laptop. That's also true in the other direction - I don't really believe that Apple's machines deliver desktop performance on battery remaining cool and quiet over longer times...