I run a big forum (5m+ posts) and was having horrendous locking issues with the vb_post table recently. I eventually figured out that the problem was in the joins it was doing with vb_dbtech_thanks_entry (possibly on threads with thousands of posts).
I haven't updated this plugin in maybe a year - has there been any database efficiency changes in the mean time to warrant me doing an upgrade now? (I don't want to lose previous likes if there is no changes, and I've made quite a few changes to customize the look and feel).
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