My website has been getting slower and slower, particularly the backend. I noticed there were a huge number of transients in database so I installed a transient cleaner plugin but this only removes expired ones. The plugin tells me there are currently 5660 timed transients in the database (13 have expired).
Is this the problem? The slowness is getting worse and worse and now (it may not be related but) I can't upload images to the Media Library - it seems to only upload the oiginal, not any of the different crops and sizes - and a recent upgrade of the Mailchimp for WP plugin failed to work - getting the white screen on one of the options pages.
Any advice would be gratefully received!