Same
I moved home for the summer, and my dad uses an HP super duper printer to fax overseas clients. My old printer (got it with my ibook such a long time ago) finally went kaput so I thought to just install the software to scan stuff, print, etc.
Being lazy in that regard, I paid for it.
I believe the story about the i5 bogging down. My 2008 MBP with 4 GB of memory slows to a crawl. I can't even visit the most basic websites or run textedit for the simplest scripts.
900 or more MB within 30 minutes. 70% of CPU. So I uninstalled it.
Funny enough, the built-in and updated Apple HP drivers allow me to use every part of the printer (scanning, copying, wireless printing) and is handled by Apple's programs. No need for it.
Just uninstall.
And I repair my permissions every month or so. Never has it been so bad since I installed this software. It had corrupted just about every single file in the Airport Utility software package, including files it shouldn't use (too long to list).
Just uninstall, use Apple's built-in. There's a reason their unofficial motto is "it just works". And we don't need a fancy app from HP (with memory leakage.)