Have 2 instances of the exact problem mentioned here.
Previous (old) machines were Windows 2000's (latest updates), AMD Durons 1ghtz with 1gb RAM.
Updates (reinstalled) machines are Windows XP 32bit (latest updates), AMD Sempron 2800 (2gb RAM) and a Intel core 2 6300 (1.5gb RAM).
The Sempron has an Oki C7350 attached to LPT1.
The core 2 has a Toshiba TEC B-SV4 attached to LPT1.
Have 2 instances of this exact problem (print jobs were quick in Win2000 and now slow on XP machines).