Client running slow in start up

The problem is when I open the project or change one screen to another screen, you can see the upside picture, it will be very slow to wait(3-4 seconds), I have never meet this situation, the problem is all the project have the same issue and if the project is start or the screen change is complete, everything is normal

I have check the ignition gateway status that is very normal, do some one have experience have this problem

I also try to run the client on the server machine, the same problem that means there are nothing to do with the network issue.
my version is 8.1.0 RC1