why does the engine take so long to analyze?

@SoreLoser maybe because your ping is high(?). It normally works around 180 but sometimes I face delay in analysis when my ping reaches around 300.

I thought so, but even when my wifi is fast, it takes a long time to analyse a game

@SoreLoser maybe you can raise this issue on lidraughts feedback.
To me, it's working fine. Or maybe only a problem to your device.