@Pleskie,
Well, to explain a bit about the degree of responses, I have to mention the following:
a) the forum is a "community forum", in the sense that it is "by and for" forum members, even though sometimes the forum is mistaken for a "support forum",
b) there used to be an Expert Program and the members of that program were forum members with considerable expertise, spending time on the forum on a voluntary (!) basis
In the past, these Plesk Experts were distinguishable by their (distinctive) badge, which badge has seemed to be lost somehow.
I am or was one of the Plesk Experts.
However, a new Plesk Expert program has been introduced, with considerable emphasis on certification (read: a lot of exams, followed by certification).
I have been discussing that new Expert program and the loss of the distinctive badge with Plesk Team, to no avail.
In essence, there is now one (or maybe two) certified Plesk Expert(s), who has to deal with the forum (again) on a voluntary (!) basis.
It is not clear yet what the role of the "former Plesk Experts" will be, but that does not bother me, I will keep answering questions if I can.
c) Plesk Team is often rather busy, so some patience would be rather appropriate.
In summary and conclusion: given the above, it is not surprising that answers do not follow or do not follow immediately.
I did have a look at the other topic, but I am not sure what happens there: a connection throttle on the side of your server, or a connection throttle on the APS server side.
You can check the presence of a connection throttle on your server by simple using FTP (filezilla), uploading a (single) file of something like 10MB and watching the transfer rates.
I am pretty sure that the transfer rates will be ok.
In the latter case, you can always do a (software) reboot (command "reboot" in SSH) and that will often clear up any issues on the side of your hosting provider.
After all, if you get to the limits of your allowed traffic, most hosting providers will provide a bandwidth throttle, but that is not as low as 500bytes per second.
The reboot will also take care of all useless processes that have no endresult, but keep on using bandwidth and/or available connections.
If all of the above does not help, one has tot suspect an entirely different root cause of the problem, very likely not to be related to the APS server.
Just try.......and send me a PM if it does not work.
Regards....