Photon Fusion connection takes 16 seconds. Why is it so slow?

I'm testing the photon fusion example. (Tank, Hello Fusion)

Everything else is great, but the process of creating a room with host/client and the client connecting to the host is too slow. It takes between 15 and 20 seconds.

Why is it so slow? Is there any way to improve the startup speed?

(I live in South Korea. and regardless of region, the results were all the same.)