Yes, it does sound like something is amiss.
During the login process, Lottery Post does a browser test to see if anything is wrong with your connection. It normally places a warning on the login page if it finds something.
Does it display such a warning on the login page? If so, I would recommend trying to fix whatever it found.
If not, can you go to the Browser Compatibility Test in the Resources menu and click the "Send to Administrator" button to send me a copy?
On the Firefox issue, I personally would not recommend tinkering with the Firefox 3 settings. I have found them to be more than adequate for screaming performance. All the settings I have ever posted about were only for Firefox 2.
Last, it is also possible that you have some kind of Internet security/Firewall software installed that is slowing down your connection. It is a very broad topic, so it is difficult for me to suggest exactly what it could be blocking, but it is always a good idea to completely disable any such software and try again. If the problem disappears, you have narrowed down the problem.
I can't tell you how many times a firewall has caused similar problems for me, and it is almost the first place I look for those kinds of problems now.
The main issue is that most security packages set their security settings too high. Especially under Vista, there is no need for very high security settings, because the operating system itself is much more secure.
The most important thing to have is anti-virus. It should have a real-time scanner and a weekly or monthly full scan.
The next thing I would recommend (in terms of importance) is e-mail scanning software, usually called anti-spam. You should use an e-mail software package, NOT web-based mail. That's because you lose all the benefit of your anti-spam software when you use something based in the web browser.
If you have Microsoft Outlook installed (usually comes with MS Office), then use that. If not, then I'd strongly recommend downloading the new Live Mail from Microsoft. It's free, and it integrates with most free mail boxes, like Hotmail, etc. So you get the benefits of a software package (that utilizes anti-spam) with free e-mail.
For a spyware program, Microsoft's Windows Defender is just great. It is free, and is highly rated.
Last, a firewall. I don't recommend getting all nutty with a firewall, because it's really not necessary. Most of the time, the very restrictive firewalls just cause problems. I would recommend using the built-in Windows firewall, because it is plenty good to block 99% of possible intrusions.
I know I got a little off-track, but it did seem relevant to your problem. Good luck!