[TriLUG] Need help finding bottleneck

[Roy Vestal]

Hey guys...need some troubleshooting help...

Symptom:
when I load my webpage from home, or my gallery, it takes literally 
minutes to load. http://website/gallery for example can take upto 5 min 
to load.

When I'm at work, it loads great, within just a few seconds.

Hardware setup:

Webserver:
P3 550MHz
256MB
CentOS 4.4 / Apache 2.something
100MB
cable modem - std account
dyndns free name hosting
router/firewall

Question:
  Would a local caching dns server help?

Suggestions?

TIA
Roy