Is Lubuntu Faster Than Windows XP And Frankly Who Cares?
Scientifically there is a reason Windows XP slows down over time and it is due to the file allocation table and the fragmentation of the hard drive.
When you start with a freshly installed system all the files are at the start of the disk. As files are added and deleted they space out over the disk, leaving gaps.
A recommended performance improvement for Windows XP is to defragment the hard drive.
All of those Windows engineers couldn't have been wrong for all those years could they?
No they weren't.