Heh, looks like we have hijacked this thread. I do agree Chrome does seem to handle resources better. Ive tested it with my home systems here. My systems with lower specs Chrome does run better then Firefox 3, Opera seems to beat both of them however. (I haven't tried these systems with Firefox 4 yet)
Now I don't work on customer's systems like you do, so i know you have a much larger range for testing, but here are the systems I have tested Firefox vs Chrome on. Its interesting the results
Dual PIII 600MHz, 2GB RAM: Preferred Firefox
Celeron (Prescott P4 based) 3.2GHz, 512MB RAM: Preferred Chrome
Celeron (Northwood P4 based) 2.6GHz, 1GB RAM: Preferred Firefox
P4 1.5GHz, 256MB RAM: Preferred Chrome
P4 2.8GHz w/HT, 1GB RAM: Preferred Firefox
P4m 2.8GHz, 512MB RAM: Chrome ran better, but for some reason this laptop preferred videos on Firefox ( I don't get why :/ )
Core i5 3.2GHz, 4GB RAM: Couldn't tell a difference in performance between the two