Using my laptop I've gone from original immediate page load to 3-5 seconds per page. No issue on other sites. Again not sure if it is this site or Windows update. For good measure the post reply button seems hit and miss also. I get an error message telling me to enter a valid message before it posts up.
I've also noticed it's slow, today I clicked to post a reply and nothing happened. After about 10 sec I clicked post again and got the you must wait 15sec error. If the problem was my isp then would your server see the quick repost?