Bufferbloat A–F Grade

The #1 reason a fast connection still lags in calls and games. We saturate your link and measure how much your latency spikes under load — then grade it A to F.

📉 What is bufferbloat?

When your link is fully used, oversized router buffers queue packets instead of dropping them. That queue adds latency — so a 500 Mbps line can still feel terrible on Zoom or in games the moment something else is downloading.

🎯 How we grade it

We measure idle ping, then ping again while saturating the download. The increase is your bufferbloat. A+ <5ms, A <30ms, B <60ms, C <100ms, D <200ms, F 200ms+.

🛠️ How to fix it

Enable SQM / QoS (fq_codel / cake) on your router
Set bandwidth limits slightly below your plan
Use a router that supports smart queue management
Wire critical devices via Ethernet