Nobody does it worse than imgur.com . You upload something and there is no indication, no feedback, nothing
The first paid programming job I ever did was writing some relocatable machine code in a USR$ because the patron's BBS couldn't calculate the XMODEM CRC in BASIC fast enough to support the upgrade to his new 1200 baud modem. I know I got paid $20 and I think it was about 20 bytes of code. I wish I got paid $1/byte for code I write today!
I mean, nowadays I am not very much into the "actually" arguments: I really don't deem it that important that older computers were better specialized for lower input lag. I just want that lower input lag back.
Complexity in modern machines and OS-es has grown too much. I feel a next Linux-like revolution might be coming that addresses this -- although this time around it would be much slower and gradual so it might not actually constitute a revolution per se. More like evolution.
I'm all for fixing the million annoyances in modern UX. The Web was built by something even worse than a committee -- it was built by a thousand committees. But let's not have rose-colored glasses, either. Computers in 1983 and 1998 were immensely frustrating, and some of what makes computers slow today is also what makes them better than the half-baked, hard-to-use, fifty-pound monstrosities of the past. We can and should do better in the future, but not if we mis-remember the past.
It used to be that software would get slower due to more and more baggage (or "technologies") it accumulates, but hardware would get faster at a higher rate. The past 10 years software keeps piling up more and more libraries but CPU performance is essentially stuck and even more, we have the shift to mobile, which means underpowered computers. This inevitably leads to bloated , slow systems , or "UX".