[question]master-slave sync delay

[jiangwen jiang]

Hi, all:

There is a problem about master-slave sync delay,
I find some infomations from 'show processlist', some like that:

1051    system user             ns    Connect 10       update  xxx

what does Connect mean, mysql manual explained:

Connect

A replication slave is connected to its master.
Then, There is 10s delay from master to slave.
I want to know why does this happend, slow network I/O? or something wrong
with this update SQL?

Thanks
Regards

W.J