Hello!

I am looking for an old Dilbert comic with the punch line that waiting
for web pages to load has negated the productivity of the industrial
revolution.

Any chance you can track that down - or narrow down a range of days it
might have run on?

Thanks!
Alise

Here is a scan of the Dilbert strip to which you refer:

Al Donovan's Dilbert Pages: Dilbert 05-05-1997 
http://pag.csail.mit.edu/~adonovan/dilbert/show.php?day=5&month=5&year=1997

My search strategy took a roundabout method. After having tried
several Google Image searches that failed, I located the strip's date
of publication here:

"Dilbert (cartoon of 5/5/97) claimed that the 'total time that humans
have waited for Web pages to load...cancels out all the productivity
gains of the information age.' Dilbert is certainly not the only
curmudgeon who has questioned whether the spread of information
technology has brought with it benefits that are consistent with
either the amount of computer investment or the vast increase in
computer speed."

The Centre for the Study of Living Standards: The Solow Productivity Paradox
http://www.csls.ca/events/cea1998/revpaper.asp 

This was the search string that led me to the CSLS quote:

Google Web Search: dilbert productivity
://www.google.com/search?hl=en&q=dilbert+productivity

Once I had the date of publication, I went to Al Donovan's Dilbert
Pages, where I found the cartoon strip.

I hope this is precisely what you need! If it is not, or if a link
doesn't work for you, please request clarification; I'll gladly offer
further assistance before you rate my answer.

Best regards,
pinkfreud

Excellent! This is a cool service.  I appreciate the good and fast work!