Are you getting stuck when you INITIALLY get onto the internet or is it all the time?
Does this vary depending on the time of day?
Have you installed anything recently that may be updating because it is newly installed but old code.
Depending on what computer and what operating system you are using, you may have content indexing enabled, automatic updates enabled, active anti-spyware enabled, it may even be your firewall checking the websites before letting you on.
What computer?
What operating system?
What firewall?
What anti-malware software?