wpslimstat kills my server

Before disabling wpslimstat, I had horribly high CPU usage. MySQL showed this:

mysql> SHOW PROCESSLIST;
+-------+---------+------+-------------------------------+------------
| Id    | Command | Time | State                         | Info                                                                                                 |
+-------+---------+------+-------------------------------+-------------
| 12990 | Sleep   |   27 |                               | NULL                                                                                                 |
| 12994 | Query   |   70 | Sending data                  | SELECT id FROM wp_slim_stats WHERE ip = '3191469579' AND language = 'en-us' AND country = 'a         |
| 12996 | Query   |   70 | storing result in query cache | SELECT id FROM wp_slim_stats WHERE ip = '2921651987' AND language = 'xx' AND country = 'us'          |
| 12999 | Query   |   66 | Sending data                  | SELECT id FROM wp_slim_stats WHERE ip = '2975066379' AND language = 'pt-br' AND country = 'b         |
| 13000 | Query   |   70 | Sending data                  | SELECT id FROM wp_slim_stats WHERE ip = '1113027096' AND language = 'en-us' AND country = 'u         |
| 13001 | Query   |   71 | storing result in query cache | SELECT id FROM wp_slim_stats WHERE ip = '2921651987' AND language = 'xx' AND country = 'us'          |
| 13005 | Query   |   72 | storing result in query cache | SELECT id FROM wp_slim_stats WHERE ip = '2921651987' AND language = 'xx' AND country = 'us'          |
| 13010 | Query   |   72 | Sending data                  | SELECT id FROM wp_slim_stats WHERE ip = '3191469579' AND language = 'en-us' AND country = 'a         |
| 13012 | Query   |    4 | Sending data                  | INSERT INTO wp_slim_stats ( ip, language, country, searchterms, resource, content_info_id, browser_i |
+-------+---------+------+-------------------------------+-------------
11 rows in set (0.13 sec)

A day after disabling it, everything has been great. I was using 2.8.2 because I don’t plan to update the WP instance.

https://wordpress.org/plugins/wp-slimstat/