I missed the main event, poorly again. Anyway turned my monitor back on at 18:30 yesterday, and advintage is sporadically misbehaving again, with 4 events caught taking over 5 seconds to respond. (Normal is about 0.2s)

As noted before, most of the delays occur in the wee small-hours and are unlikely to be caused by member activity. After the last outbreak, the web team made 3 or 4 significant changes to advintage, which seemed to have fixed it. Seems not!
Advintage isn’t part of the forum as such, rather adverts are served from a separate host with different software which is malfunctioning. Unfortunately our browsers wait for delayed adverts, making the whole forum look bad.
The evidence strongly suggests this is a server end bug, not related to our client-end operating system, browser, computer or network connection, or anything members are doing.
Dave