Windows 9x achieved performance only a small factor slower than what we've got today on 1000x faster hardware.

VS6 was mentioned in a sibling comment - Casey Muratori's project loading and watch window stories come to mind. He had a video, which I can't find any more, showing him loading an identical project, compiling, starting the debugger, and watching a variable while single-stepping in VS6 on Windows 95 on Windows 95-era hardware, and the same on Windows 10 on Windows 10-era hardware. Guess which one was faster. It wasn't Windows 10.

Yes when we talk about the past there's an element of nostalgia-tinted glasses but there's also an element that stuff is just fucking worse now, and for no good reason. (I blame landlords - think about it. The whole economy is being pushed to do more with less because the value extraction related to land keeps increasing.)

Discord today does not load more quickly than MSN Messenger used to.