https://www.xda-developers.com/reasons-bufferbloat-worst-networking-problem/

> Bufferbloat is a lesser-known but still critical networking issue that 
> can cause numerous problems. It's caused by excessive buffering in 
> network devices like routers and modems, creating latency and making 
> your internet feel sluggish even if you should have high speeds. If 
> you've ever experienced lag while gaming, on a video call, or in other 
> scenarios, and you're not sure why that might be the case, then 
> bufferbloat might be the reason why.