Slow Query and the wordpress backend is very slow

mysql> SELECT COUNT() FROM wp_statistics_visitor; +----------+ | COUNT() |
+----------+
| 1565438 |
+----------+
1 row in set (0.30 sec)

mysql> SELECT COUNT() FROM wp_statistics_visitor_relationships; +----------+ | COUNT() |
+----------+
| 6541861 |
+----------+
1 row in set (8.42 sec)

mysql> SELECT SQL_CALC_FOUND_ROWS id FROM wp_pmpro_membership_orders ORDER BY id DESC, timestamp DESC LIMIT 5;
+--------+
| id |
+--------+
| 258246 |
| 258245 |
| 258244 |
| 258243 |
| 258242 |
+--------+
5 rows in set (0.99 sec)