I think it's heavily dependant on the site you're using. Loading this page in Firefox on android with a pretty crappy connection took ~2 seconds. In the Tor browser it was ~6seconds
Definitely slower and this is a pretty minimal page, but I've got a hunch it really starts to choke when a page is loading a ton of different css/js assets at load
What's still often slow in Tor is making initial connections to hidden (onion) services. Last year during a DDoS attack on Tor this was unreasonably slow and took minutes or more, at which point sites just appeared broken. Once connected, though, it would still work pretty well. So if your experience is using Tor to access onion services you might have an inflated idea of its slowness for normal purposes.
Visits to normal websites were only somewhat affected and were still pretty reliable.
I don't think they are subjective at all. Tor is inherently slow based on how it works. It has gotten faster since inception but even in last year or two it is a multiple slower. Until that is non-existent adoption will be challenging at best.
What I’m saying is that Tor used to be, many years ago, annoyingly slow, sometimes even excruciatingly so. But today I don’t even notice that I’m using Tor. It might be “a multiple” slower, but I don’t notice it, is my point.