It's taking so much time for computer analysis.
Almost takes more than 15 minutes, the server is slow.
It takes around 3 to 4 seconds per move, if the game is getting analysed. It's quite possible that there was no free client active or even no active client at all, so maybe you had to wait for that. If you want to help with server analysis, you can find some info here github.com/WandererXII/shoginet.