This article explains how to troubleshoot performance-related issues with Cloud WMS.
Troubleshooting involves two steps:
Bandwidth http://speedtest.net testing
Latency (ping test) testing. You can measure the latency between your computer and a web address with the ping command.
Open a Command Prompt window (CMD) from your Start menu
Run a command like a ping datapel.com
this screenshot shows no problems
this screenshot shows latency issues with regular "Request timed out".
Further info can be found in this article https://www.howtogeek.com/138771/htg-explains-how-latency-can-make-even-fast-internet-connections-feel-slow/
For some users, their bandwidth test might be good, but the latency test is not. This will cause the system to appear slow.