Now, imagine those letters arrive at 1.01s, 2.50s, and 3.02s. That second letter was delayed by half a second. Your computer has to scramble to re-order those letters. When it can't keep up, you get stutters, echoes, and dropouts.
The culprit is likely .
Ironically, some routers' automatic traffic shaping causes jitter. Log into your router, find QoS settings, and turn it off . If your router is old, turn it on and set it to "FQ-CoDel" if available.
Type: ping -n 50 8.8.8.8 (This sends 50 pings to Google)