Question MySQL Slow Query

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This is from my database server slow query log:

Code:
 use lipstick_forum;
SET timestamp=1346993407;
SELECT
                                user.userid,
                                username,
                                usergroupid,
                                membergroupids,
                                displaygroupid,
                                infractiongroupids,
                                user.dbtech_usertag_excluded AS excluded,
                                relationid,
                                userlist.type,
                                friend,
                                dbtech_usertag_settings,
                                email,
                                languageid,
                                options,
                                adminoptions
                                , mention.dateline
                        FROM user AS user
                        LEFT JOIN userlist AS userlist ON (userlist.userid = user.userid AND userlist.relationid = '103282')
                        LEFT JOIN dbtech_usertag_mention AS mention ON(mention.mentionedid = user.userid AND mention.postid = '10893141' AND mention.type = 'post')
                        WHERE username IN(0., 0.3, 0.32, '0.32 s', '0.32 se', '0.32 sec', '0.32 sec m', '0.32 sec ma', '0.32 sec mar', '0.32 sec mark', '0.32 sec mark[');
# Time: 120907  0:51:35
# User@Host: root[root] @  [10.0.47.23]
# Query_time: 10.743148  Lock_time: 0.000073 Rows_sent: 65513  Rows_examined: 40553179
SET timestamp=1346993495;
SELECT
                                user.userid,
                                username,
                                usergroupid,
                                membergroupids,
                                displaygroupid,
                                infractiongroupids,
                                user.dbtech_usertag_excluded AS excluded,
                                relationid,
                                userlist.type,
                                friend,
                                dbtech_usertag_settings,
                                email,
                                languageid,
                                options,
                                adminoptions
                                , mention.dateline
                        FROM user AS user
                        LEFT JOIN userlist AS userlist ON (userlist.userid = user.userid AND userlist.relationid = '103282')
                        LEFT JOIN dbtech_usertag_mention AS mention ON(mention.mentionedid = user.userid AND mention.postid = '10893141' AND mention.type = 'post')
                        WHERE username IN(0., 0.3, 0.32, '0.32 s', '0.32 se', '0.32 sec', '0.32 sec m', '0.32 sec ma', '0.32 sec mar', '0.32 sec mark', '0.32 sec mark[');
# Time: 120907  0:52:58
# User@Host: root[root] @  [10.0.47.23]
# Query_time: 10.815501  Lock_time: 0.000098 Rows_sent: 65513  Rows_examined: 40553179
SET timestamp=1346993578;
SELECT
                                user.userid,
                                username,
                                usergroupid,
                                membergroupids,
                                displaygroupid,
                                infractiongroupids,
                                user.dbtech_usertag_excluded AS excluded,
                                relationid,
                                userlist.type,
                                friend,
                                dbtech_usertag_settings,
                                email,
                                languageid,
                                options,
                                adminoptions
                                , mention.dateline
                        FROM user AS user
                        LEFT JOIN userlist AS userlist ON (userlist.userid = user.userid AND userlist.relationid = '103282')
                        LEFT JOIN dbtech_usertag_mention AS mention ON(mention.mentionedid = user.userid AND mention.postid = '10893141' AND mention.type = 'post')
                        WHERE username IN(0., 0.3, 0.32, '0.32 s', '0.32 se', '0.32 sec', '0.32 sec m', '0.32 sec ma', '0.32 sec mar', '0.32 sec mark', '0.32 sec mark[');
# Time: 120907  0:53:13
# User@Host: root[root] @  [10.0.47.23]
# Query_time: 10.342486  Lock_time: 0.000138 Rows_sent: 65513  Rows_examined: 40553179
SET timestamp=1346993593;
SELECT
                                user.userid,
                                username,
                                usergroupid,
                                membergroupids,
                                displaygroupid,
                                infractiongroupids,
                                user.dbtech_usertag_excluded AS excluded,
                                relationid,
                                userlist.type,
                                friend,
                                dbtech_usertag_settings,
                                email,
                                languageid,
                                options,
                                adminoptions
                                , mention.dateline
                        FROM user AS user
                        LEFT JOIN userlist AS userlist ON (userlist.userid = user.userid AND userlist.relationid = '103282')
                        LEFT JOIN dbtech_usertag_mention AS mention ON(mention.mentionedid = user.userid AND mention.postid = '10893141' AND mention.type = 'post')
                        WHERE username IN(0., 0.3, 0.32, '0.32 s', '0.32 se', '0.32 sec', '0.32 sec m', '0.32 sec ma', '0.32 sec mar', '0.32 sec mark', '0.32 sec mark[');
# Time: 120907  0:54:39
# User@Host: root[root] @  [10.0.47.23]
# Query_time: 10.668926  Lock_time: 0.000081 Rows_sent: 65513  Rows_examined: 40553179
SET timestamp=1346993679;
SELECT
                                user.userid,
                                username,
                                usergroupid,
                                membergroupids,
                                displaygroupid,
                                infractiongroupids,
                                user.dbtech_usertag_excluded AS excluded,
                                relationid,
                                userlist.type,
                                friend,
                                dbtech_usertag_settings,
                                email,
                                languageid,
                                options,
                                adminoptions
                                , mention.dateline
                        FROM user AS user
                        LEFT JOIN userlist AS userlist ON (userlist.userid = user.userid AND userlist.relationid = '103282')
                        LEFT JOIN dbtech_usertag_mention AS mention ON(mention.mentionedid = user.userid AND mention.postid = '10893141' AND mention.type = 'post')
                        WHERE username IN(0., 0.3, 0.32, '0.32 s', '0.32 se', '0.32 sec', '0.32 sec m', '0.32 sec ma', '0.32 sec mar', '0.32 sec mark', '0.32 sec mark[');
# Time: 120907  0:57:10
# User@Host: root[root] @  [10.0.47.23]
# Query_time: 10.327048  Lock_time: 0.000108 Rows_sent: 65513  Rows_examined: 40553179
SET timestamp=1346993830;
SELECT
                                user.userid,
                                username,
                                usergroupid,
                                membergroupids,
                                displaygroupid,
                                infractiongroupids,
                                user.dbtech_usertag_excluded AS excluded,
                                relationid,
                                userlist.type,
                                friend,
                                dbtech_usertag_settings,
                                email,
                                languageid,
                                options,
                                adminoptions
                                , mention.dateline
                        FROM user AS user
                        LEFT JOIN userlist AS userlist ON (userlist.userid = user.userid AND userlist.relationid = '103282')
                        LEFT JOIN dbtech_usertag_mention AS mention ON(mention.mentionedid = user.userid AND mention.postid = '10893141' AND mention.type = 'post')
                        WHERE username IN(0., 0.3, 0.32, '0.32 s', '0.32 se', '0.32 sec', '0.32 sec m', '0.32 sec ma', '0.32 sec mar', '0.32 sec mark', '0.32 sec mark[');
# Time: 120907  0:57:26
# User@Host: root[root] @  [10.0.47.23]
# Query_time: 10.497717  Lock_time: 0.000103 Rows_sent: 65513  Rows_examined: 40553179
SET timestamp=1346993846;
SELECT
                                user.userid,
                                username,
                                usergroupid,
                                membergroupids,
                                displaygroupid,
                                infractiongroupids,
                                user.dbtech_usertag_excluded AS excluded,
                                relationid,
                                userlist.type,
                                friend,
                                dbtech_usertag_settings,
                                email,
                                languageid,
                                options,
                                adminoptions
                                , mention.dateline
                        FROM user AS user
                        LEFT JOIN userlist AS userlist ON (userlist.userid = user.userid AND userlist.relationid = '103282')
                        LEFT JOIN dbtech_usertag_mention AS mention ON(mention.mentionedid = user.userid AND mention.postid = '10893141' AND mention.type = 'post')
                        WHERE username IN(0., 0.3, 0.32, '0.32 s', '0.32 se', '0.32 sec', '0.32 sec m', '0.32 sec ma', '0.32 sec mar', '0.32 sec mark', '0.32 sec mark[');

This is only happening with one user. The user only had 3 mentions and no tagged threads. Any idea what could be causing this?
 
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