I'm assuming that folks are trying to view this from their homes and not in a school lab since you mention parents. If that's correct, it wouldn't be the ISP unless everybody is on the same network like if it was run by the local government. The virus protection also comes to mind but again if it;s different folks, not everybody will have had that problem. (At least I hope not.)
I note that the poster is coming in from a school IP address. Folks have seen problems previously is they're all coming in from a lab together. If there's a firewall in place, it'll think all of the connections going to a single site is an attack and it'll usually try to prevent it.
A number of other things come to mind but they're all ruled out if folks are trying to access the site from different connections.
You don;t have any sort of ISP run by the town, do you? I know some communities put out their own town covering wireless or cable companies. That's really the only thing I can think of.
Definitely weird because I guessed that was the blog and when I checked it yesterday it is loading fast in both Flock and Internet Explorer. As you say very clean looking blog Dr Mike with none of the obvious reasons for slow loading.
So it makes me wonder if there is something running on their computers that is causing the problem. Can you find out what web browser they are using? Perhaps they are using a Mac and Safari? Or maybe they have some sort of filter in place to stop their children accessing particular sites and that is causing an issue. Also worth checking what antivirus software they are running. What else Dr Mike could they check?