I'm aware the site has been slower than normal in past 24 hours, sometimes unusable at peak times (i.e. evening) with "504 gateway timeout" error pages.
The issue is a software problem, specifically with the database server, all of a sudden it's using up a lot of CPU and hanging, I've tried the usual fixes and it's made it slightly better but still not normal and site gets slow.
I don't have much time to look into it further at the moment.
In the meantime I've had to disable a few things to reduce processing usage, so some things like review counts may not be up to date.
Over the coming weeks I will have to bring the site down for around 2 hours to format the server and upgrade to latest server OS, etc. I will announce when I know it's going to happen when I decide when.