MySQL high load

Full queries are like this:

SELECT ID, post_title, post_date, post_content, (MATCH (post_content) AGAINST ('�^�ο�^� �^��^�ν και κ η �^�ην με �^��^�ι �^�ο �^��^�ην ο �^�$
 from wp_posts
 left JOIN wp_term_relationships AS thistag ON (thistag.object_id = 2190 )
                left JOIN wp_term_relationships AS tagrel on (tagrel.term_taxonomy_id = thistag.term_taxonomy_id
                AND tagrel.object_id = wp_posts.ID)
                left JOIN wp_term_taxonomy AS tagtax ON ( tagrel.term_taxonomy_id = tagtax.term_taxonomy_id
                AND tagtax.taxonomy = 'post_tag')
 left JOIN wp_term_relationships AS thiscat ON (thiscat.object_id = 2190 )
                left JOIN wp_term_relationships AS catrel on (catrel.term_taxonomy_id = thiscat.term_taxonomy_id
                AND catrel.object_id = wp_posts.ID)
                left JOIN wp_term_taxonomy AS cattax ON ( catrel.term_taxonomy_id = cattax.term_taxonomy_id
                AND cattax.taxonomy = 'category')
 where (post_status IN ( 'publish',  'static' ) and ID != '2190') and post_date <= '2008-10-15 19:42:45'  and post_password =''  and post_type IN ('post', '$
 group by id
 having score >= 5 and tagscore >= 1 order by score DESC limit 3;