I found /etc/rc.d/rc.nginx restart to restart nginx, after that the ui is blazing fast again... but termianl is no longer working
Feb 11 00:47:01 Unraid-Server nginx: 2019/02/11 00:47:01 [crit] 6635#6635: *102506 connect() to unix:/var/run/ttyd.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.86.42, server: , request: "GET /webterminal/ HTTP/2.0", upstream: "http://unix:/var/run/ttyd.sock:/", host: "7e8791b3aa0bbd8fe33ae9faa95413a1af5ece0a.unraid.net:444", referrer: "https://7e8791b3aa0bbd8fe33ae9faa95413a1af5ece0a.unraid.net:444/Main"
So i guess it would be good idea to higher that child thing.