Playit GG is very slow, (Ngrok works fine), the server in Singapore, how i fix it ? My problem or their server lagging ? 
Our hosting provider changed ISP agreements in your Singapore datacenter so the routing got worse. I did some tuning yesterday and it appears to have resolved the issue for other users. 
it also fixed it for you.
Ok! Thank you very much, then I would like to ask why my phone often fails to join when I use the Geyser MC addon? (But Minecraft for windows Bedrock can be played very smoothly?)