Apache/chromium slow

[Roger]

I have Fedora 16 latest updates developing a drupal 7 site on my home pc 
in /var/www/html/drupal/.

I'm finding that some admin pages, eg, permissions, can take over 2 
minutes to load and similar to save changes.
top doesn't show anything out of the ordinary, memory is no more than 
<20% of 2 gig, /swap is not used.
How can I watch/trace exactly what is happening to cause significant delays.
These delays do not occur on the remove server, just on my home machine.
Thanks for help
roger