Network latency is the invisible hand behind every laggy call and stuttering stream. Checking it properly is the first step to fixing it.

Start with a baseline: test when nothing else is using the network. Then test during heavy use. The gap between the two reveals bufferbloat or congestion.

If latency is high even at idle, the problem is likely your ISP routing or a failing modem. If it only spikes under load, your router's queue management needs attention.

Run the check below, note your idle vs loaded numbers, and you'll know exactly where to look next.