OMG this will likely cause a giggle or two. I have a Sony Vaio that employs a Pentium II @ 450MHz, maxed out with 256MB ram that is a multi-boot box. It has FreeDoS, OS/2 Warp 4.5, WinXP and Slackware 12.2 on it. I replaced the hard drive with a 7200 rpm Seagate 100 GB drive, and everything runs really well except for XP. Not joking.
I'm uncertain why XP isn't all that terrible to boot but certain applications are just excruciatingly, "go postal" slow such as Networking Properties.
Slackware 12.2 is slow by modern standards but not at all painful and is actually quite useful.
It rather cracks me up that OS/2, which came out around the time of Win95 (which will not run on a 64bit system or even one with more than 1GB of RAM), will not only run like a scalded cat on amphetamines on a 64bit CPU with 64 GB RAM, but the very same OpSys is quite snappy on this P2 450 w/ 256MB, even though it has a full X11 desktop (I run a version of Enlightenment most often) but these days more often than not I just stick with Warp Center to remind myself where I am.
Edit: Oops! Sorry OP I was so hot to post this lil' beast that I did so before I read any more than the subject line. Didn't realize you were shopping for more than "war stories". Hope it's worth a giggle or a wrinkled brow :P
Last edited by enorbet; 01-29-2014 at 07:59 PM.