Hi Cliff,
as mentioned in my last post, the posted SQL queries are the bottleneck. Because we’re coming into a massive temp & file sort. This is due the wp post meta data model, querying the _EventStartDate meta_value without any index. As we’re dealing with roundabout 50.000 events and therefore more then a half million post meta rows.
You can take a look here … be patient 😉
http://www.akt-magazin.de/veranstaltungen
I’ve tried some my.cnf tuning on the buffer and temp table options like sort_buffer_size, read_rnd_buffer_size, tmp_table_size, max_heap_table_size … without any notable effects. Maybe you got some advice for tuning the MySQL server for our special needs?