#LightingStrikes tip: Salesforce has a built-in speed test that measures the connection speed straight from your browser to the Salesforce servers.

Update this URL for your environment and click "test speed": https://yourdomain.lightning.force.com/speedtest.jsp

Next time users complain about slow performance, you can know for sure if a slow network connection is an issue.

Documentation here: https://help.salesforce.com/articleView?id=console2_technical_requirements.htm&type=5