To me, anything slower than 1.5 GHz is slow. A Celeron 667 MHz is "SLOWWWW" to me. That's just opinion, though, as a Celeron 667 can be functional enough for many (as BC_Programmer has indicated earlier with his AMD K6-2 350 MHz).
Which is faster: a 1.2Ghz Machine trying to Run Vista or a 40 Mhz 386 running DOS 6?
The "trick" is to use the OS and software that best matches the hardware; when I do that, I can almost always get a decent speed.
I got so used to the speed of my old computer, that when I got this "new" one, by the time I noticed a slowdown from an malware infection, it was quite deep! (with my K6, I usually could tell when their was a single malware process... they aren't exacty optimized for speed...)
additionally; CPU differences other then speed play a big factor. I don't think a Celeron 667 would be any faster then my K6, since, AFAIK, the Celeron line was stripped of some of it's On-die cache.
As far as linguistics, I've only recently overcome my peeve for words that should be spelled with ou spelt with an o, such as "colour" "honour", and so forth.
The neat part came when I wrote my own colour library, since all the standard color stuff was using the americanized word, Color, I could simply use the standard Colour and not have to worry about naming conflicts.
One curiosity for me has been the words Grey, and Gray. Which one is the original and which one is correct?