Performance checking

I need a good way to look at the performance of our web site. We have 
a small home page (35K), yet some people (notably one of our VPs, 
connecting from home, using AT&T @Home and a cable modem) report our 
site does not load as quickly as it should. I can't say for sure 
whether he is wrong or right and have no real performance monitors in 
place. I do sometimes see a pause with one page or another.

My question is whether anyone can recommend some site performance 
services or tools or other ideas.

A little background:

- Site is http://www.maxim-ic.com

- We are running four Unix servers, co-located at Exodus, and they 
are very lightly loaded. We serve about 13,000 PDF data sheets 
(typically 50K each) a day and around a million static pages a month. 
Apache is on one machine; database and Cold Fusion on a second; the 
other two are loafing.

- We run Apache for our static pages and some of the site -- maybe 
20% of traffic -- comes from Cold Fusion, serving from Sybase SQL. 
Perceived speed problems are not limited to Cold Fusion-served pages.

- We use server side include to serve our page headers and footers. I 
know it's not the best practice but figured that with our processors 
so lightly loaded, we were OK.

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