Gitlab speed is so slow

1, I install gitlab into a virtual machine on my mobile pc, Gitlab work normally, the speed is very OK
2, deployed to the enterprise online
2.1 virtual machine is deployed to my local test is more powerful on the, various functions are OK,but speed is extremely slow, such as SSH -T git@ip 6 minutes, GIT clone, GIT push and git pull are very slow, cannot use
2.2 computation node entity machine test (2U special blade 32 thread memory 500G), case is same as 2.1 cases
2.3 for a small PC machine test, same as 1.0 cases of all normal
Now want to deploy to the formal room, encounter this problem in the end how soon on GitLab lose confidence?
please help me. thank you.