You can use the W3C Resource Timing Metrics because most modern browsers provide performance metrics for important steps involved in loading pages, such as domain lookup (DNS), establishing connections to HTTP servers (TCP), and securing connections (SSL).
Read out the following link for better understanding.
Secondly enable the bandwidth calculation for the 'User Experience' and check mark in the properties of the sensor 'Measure request / response sizes' for your desired technology e.g.
There is a measure called "Network Latency" that you can use, so long as you have UEM enabled. The JS agent calculates the latency between the browser and the web server which you can chart and alert on. You can read all about it here.
For measuring those specific LAN and WAN locations, well you can define some custom geographic locations to map those users geography correctly. You can see that here, then you are all set.
Hope this helps,