I have never, in about a year of frequenting the board, had the slightest problem instantly accessing PPRuNe (from the U. S.), usually three or four times a day just to check up on new posts. The problem is obviously not the site.
I've just checked - the site's hosted on the West Coast USA. Hence potential crappy connectivity to Europe.
Might be worth shifting it to East Coast USA since the bulk of the connections are from Europe. That'd still keep it within the dirt-cheap hosting regime of the USA, whilst allowing better connectivity from this side of the pond. It'd also mean a change from a proven bad connection (given the regular issues experienced by those not in the USA).
Needs more work though, and a fair crack of the whip by the existing hosting co - they should at least be allowed some chance to fix whatever's wrong before ditching them (unless it's inherent to the location as seems a possibility, given my experience of West Coast USA hosting from Europe).
More to the point, whilst posting in here is a semi-cathartic experience, who actually owns this problem and are they reading this?