a 2011 laptop will likely perform the same on this metric with a contemporary website. (a 2011 website with a 2011 laptop, and a 2026 laptop with a 2026 website).
“how long it takes to load the mail app and send a mail”
probably the 2011 laptop out performs on this metric.
I’m sure the modern laptop is a few times more powerful in terms of raw compute, but lets not confuse compute with utility, because better laptops should mean more capabilities, not more shitty developer harnesses to make the same programs we had before.