slow query below:

# Time: 090706 15:12:30
# User@Host: cfgbeam[cfgbeam] @ [219.133.34.201]
# Query_time: 61 Lock_time: 0 Rows_sent: 0 Rows_examined: 0
update customer set showhelp=0 where cid=66;

CREATE TABLE `customer` (
`cid` int(10) unsigned NOT NULL,
`bid` int(11) default NULL,
`cno` varchar(32) NOT NULL,
`ano` varchar(cool: NOT NULL default ' ',
`cname` varchar(20) NOT NULL default ' ',
`domain` varchar(20) default NULL,
`siteid` varchar(cool: default NULL,
`score` decimal(18,2) NOT NULL default '5.00',
`money` decimal(18,2) NOT NULL default '0.00',
`regdate` datetime default NULL,
`password` varchar(32) default NULL,
`status` varchar(20) default 'normal',
`memo` varchar(255) default NULL,
`passwderrortimes` tinyint(4) default NULL,
`currency` varchar(3) NOT NULL default 'RMB',
`email` varchar(32) default NULL,
`homepage` varchar(255) default NULL,
`rcv_email` tinyint(4) default '1' COMMENT 'whether receive email notice',
`level` tinyint(4) default '1',
`avatar` varchar(255) default NULL,
`avatar_big` varchar(255) default NULL,
`rmder_cid` int(10) unsigned default NULL,
`sex` varchar(4) default NULL,
`lst_login` datetime default NULL,
`email_active` tinyint(4) default '0',
`kmoney` int(11) default NULL,
`login_fr` varchar(20) default NULL,
PRIMARY KEY (`cid`),
UNIQUE KEY `cno` (`cno`),
UNIQUE KEY `cid` (`cid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
it's a sns game server,mysql so slow,it's tuned a lots,
but event that update sql so slowly,

customer table only 150k records on a Xeon with 2G memory
somebody help me?any idea is very appreciated