The Dev forum had its own DB.
Anyway, we'll see how it goes later. It looks to me like the SEO extension may be degrading performance too so I've disabled that.
I also note that Namecheap has 50% CPU as the default allocation and I can't work out what triggers (or doesn't trigger) increasing the capacity to 200%. Yesterday it stayed at 50% all day and was continually maxed out, whereas now it's at 200% when we're nowhere near the 50% capacity