Just to report, my situation at the moment is that:
a) the site is responding in a not unreasonable time (< 3 seconds switching between pages)
b) I remain logged in over a number of days, if not weeks
c) I have not experienced any error pages being thrown up when posting, nor am I asked to login when posting a reply if already logged in (see b)
Running Win 10 Pro, fully updated, Firefox browser, fully updated, Plusnet fibre to the cabinet broadband with average download speed of 70 Mbps.
Rob