Hello everybody!
Apologies for the desperately slow speed of Mushroom over the last few days.
On investigation, I discovered it was due to the new @ notifications function which was querying too inefficiently. I have therefore removed the @ notifications function until I have time to (a) fix the query (relatively easy) and (b) align the javascript browser display with the new efficient query (troublesome).
The @ notifications system should be back in place towards the end of June.