I thing AG moderators know it
Yes, they do, a thread as been made many times.
and they are trying to fix it
The staff. Not the mods....
Anyway. If it takes less than 30 seconds for you to read a thread/replies and then type in a reply to that, you might consider not posting at all. Just a good rule of thumb.
It seems peculiar that is shhould take that long, there have only been a few reports about it, and no one else, least of all me, have noticed this time running slower to some. I figure it might have something to do with your connection, the site lagging, or your computer having a slow recaching, maybe.
But as already mentioned, if there is an error somewhere, the staff is on it. If it keeps on, you might want to file a report.
As for the post > blank page, it has been happening to me as well, so I can answer somewhat properly. This site is usually a bit glitchy in waves, which means that the entire forum sometimes is down, you are unable to visit your profile page, and the "Last post" might be featuring a "39 years ago". It is all things that just happen, and I have the strange idea it might be the staff fiddling with the codes, the servers having a hiccup or just plain overload on the activity.
I usually do not bother to go back and check, reloading the page is enough to get you to the first page of the thread and onwards from there. If that is a bit too troublesome, make a short cut to the community page and you can click that. The post is most likely posted either way.
But again, if it is all too troublesome and keep happening over and over again every time for a wekk, file a report, and the proper persons will take a look at the issue.