Re: ubuntu desktop on an old WinXP machine - performance expectations?
That's unlikely the cause, since the registry is really a collection of files that operates much like a database.
it takes a minute or two just to launch firefox. I think some of it is old hardware, but most of it is caused by windows registry breakdown.
That's agonizingly slow ... and I wouldn't expect Ubuntu (or even Lubuntu) to run any faster than that.
Also, I don't think any recent versions will fit on a CD (although, I could be wrong with Lubuntu), and that would require you to boot from a USB stick -- something your old PC most probably will not support.
Ubuntu 16.04 Mate, Mint 17.3; MS Win 8.1, MS Win10 Pro.
Will not respond to PM requests for support -- use the forums.