Right now I'm using a backup laptop with Intel Celeron. It runs most apps fine. Web sites like Hacker News come up easily and snappily. The CPU fan kicks in when I watch a high-quality movie. It also kicks in on small, web apps. Kicks in big time on Youtube and Facebook. Everything on those is sluggish compared to my native apps. Even if non-technical, I'd know stuff was about to slow down when I go into my browser.

Just bad tools leading to waste users notice. Best to avoid them if possible. Not always possible...