I have a somewhat old computer with mid-range hardware. Here's what my computer has:
1.8 Ghz Willamette Pentium 4 256 Kb L2 Cache nVidia Geforce 6200 LE 256 mB DDR2 1024 mB DDR at 133 mhz 40 GB HD 5400 RPM
Before, I used Fedora 17 with my computer, and installation was somewhat long, about 25% (All night installation) longer than Windows XP (Which took 2 hours). It ran at an OK speed, but it was slow and constantly lagged in all areas. This included starting LibreOffice in Fedora 17, loading the Applications screen, scrolling down the Applications screen, and even when switching a wallpaper and it took more than 15 seconds just for Mozilla Firefox to start up, so I eventually switched back to Windows XP in frustration with disappointment at the speed of Fedora 17.
However, I've gotten tired of XP and I want to go back to Linux. I'm looking at the Ubuntu 12.10 & 12.04 requirements which demand 512 mB of RAM and a 1.0 Ghz Pentium 4 processor, but I'm not sure if I should install Ubuntu, or try going with another desktop environment such as Lubuntu, which I've been looking into. With my previous experience with Fedora 17, I'm not sure whether or not my computer will run very smoothly using Ubuntu 12.04 or 12.10. As a result, I'm kind of stuck between Lubuntu and Ubuntu...