It shouldn't. The issue is that most developers would rather spin up another instance of their server than solve the performance issue in their code, so now it's a common belief that computers are really slow to serve content.

And we are talking about static content. You will be bottlenecked by bandwidth before you are ever bottlenecked by your laptop.

To be fair, computers are slow if you intentionally rent slow & overpriced ones from really poor-value vendors like cloud providers. For people who started their career in this madness they might be genuinely unaware of how fast modern hardware has become.