Answer by javier_domenech for mySQL Query seems to crash server

Try to add the final conditions to the joins (multiple join conditions).

If you use multiple conditions at joins instead of get a huge set and then put the condition at the end your set will be smaller and your response time may be better.

for instance, you have a final condition:

AND wp_posts.post_type = "event"

You could put it in the first join

INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) AND wp_posts.post_type = "event"INNER JOIN...

and so on.