wordpress大数据的优化以及RDS的选择问题

       1、现在用的是LINODE VPS，自建MYSQL，WORDPRESS有23万文章，尝试做了各种优化，性能不是很好，现在想转到阿里云，外加RDS，请问这么多数据的WP应该选择什么版本的RDS（暂不考虑流量，目前百十个IP），只考虑23万文章（2.3G数据表）的WP对RDS配置的需求。
       2、另外发现WP的一些常见的慢查询，请教大神有没有对应WP的优化建议。

# Time: 151025 22:46:05
# User@Host: hsdhwcom_news[hsdhwcom_news] @ localhost []
# Query_time: 5.938003  Lock_time: 0.000066 Rows_sent: 1  Rows_examined: 208056
SET timestamp=1445784365;
SELECT COUNT(*) FROM news_term_relationships, news_posts WHERE news_posts.ID = news_term_relationships.object_id AND post_status = 'publish' AND post_type IN ('post') AND term_taxonomy_id = 3;



# Time: 151025 22:22:46
# User@Host: hsdhwcom_news[hsdhwcom_news] @ localhost []
# Query_time: 5.832869  Lock_time: 0.000080 Rows_sent: 12  Rows_examined: 121952
SET timestamp=1445782966;
SELECT SQL_CALC_FOUND_ROWS  news_posts.ID FROM news_posts  INNER JOIN news_term_relationships ON (news_posts.ID = news_term_relationships.object_id) WHERE 1=1  AND (
  news_term_relationships.term_taxonomy_id IN (7)
) AND news_posts.post_type = 'post' AND (news_posts.post_status = 'publish') GROUP BY news_posts.ID ORDER BY news_posts.post_date DESC LIMIT 0, 12;