Which programs work better on 1 CPU using XP Pro

I am interested to see what programs people find works (noticably) better on one CPU only.

Not being a critical person I find my Pentium 4 Processor 640 with HT Technology works fine with most of my old applications – Adobe Photoshop Elements 3, Photoshop 7, and Office 2003 for instance…

Walter—
PS This relates to http://articles.techrepublic.com.com/5100-10877_11-6168870.html?tag=nl.e064