I kept around an old machine that ran Windows 98 because I really enjoyed some of the old programs. Unfortunately the media playback technology became so ancient that it no longer became viable for anything except software of that vintage. Plus the machine took forever to boot up, sort of like waiting for the picture tube to come on back in the 50s and 60s. Windows 7 will someday be a dinosaur but I'm not sure the technology is going to progress much further than it already has.
Actually in basic tasks like opening My Computer/Windows Explorer/File Explorer and folders, or Note Pad etc., W/9x could be as fast or faster for me than any of the XP/win8/10 PCs I have used since till my most recent, even with a 4.2. Ghz CPU and 16Gb ram.
In 2005 I was running a build with a AMD Athlon 650 MHz CPU, MSI K7Pro (MS-6195) Motherboardm with 192 MB System Memory, which was quite fast and capable for its day, as long as you watched System Resources via FreeRamXPpro. On dial-up.
Do not want to go back to that though. Thank God for what He provides, to be used for His purposes.