Bufferbloat & QoO Test
Standards-based QoO: how calls, gaming, and streaming perform under load.
Test Progress
Live during runWhy Test Bufferbloat & QoO
Traditional speed tests show peak capacity. This test shows real outcome under load: whether calls, gaming, and streaming stay usable when the connection is busy.
Speed Test
Measures throughput in ideal bursts. Useful for capacity checks, but limited for user experience under heavy traffic.
Bufferbloat Signal
Measures how much delay rises when download/upload load is added, which reveals queue pressure and responsiveness loss.
QoO (Quality of Outcome)
Combines latency, loss, and throughput by app profile so results map to what users actually feel.
What Each Phase Tests
Phase primerBaseline
Your connection's inherent latency when idle (measures base network quality)
Download
How much latency increases when downloading large files (simulates streaming, software updates)
Upload
How much latency increases when uploading data (simulates video calls, cloud backups)
Bidirectional
How much latency increases during simultaneous heavy download and upload (simulates real-world mixed usage)
Cooldown
How quickly latency recovers after stopping all traffic (shows network recovery speed)
Grade Meanings
A+ to F guideExcellent
Your connection has virtually no bufferbloat! Perfect for video calls, online gaming, and real-time applications. Your connection maintains low latency even under heavy load.
Very Good
Minimal bufferbloat with excellent performance. Great for video calls, streaming, and gaming. You may notice slight delays only during very heavy usage.
Good
Moderate bufferbloat that's generally acceptable. Good for most activities, though you might notice some lag during video calls or gaming when downloading large files.
Fair
Noticeable bufferbloat that affects performance. You'll likely experience lag during video calls, choppy streaming, and delayed responses in online games when your connection is busy.
Poor
Significant bufferbloat causing major performance issues. Video calls will be problematic, streaming may buffer frequently, and online gaming will be frustrating during heavy usage.
Very Poor
Severe bufferbloat making real-time applications nearly unusable. Video calls will drop frequently, streaming will buffer constantly, and online gaming will be extremely laggy when downloading or uploading.
Quality of Outcome (QoO)
Application impactQoO (Quality of Outcome) shows how well real apps should work on your connection when the network is busy. It focuses on user experience, not just peak speed. RFC: draft-ietf-ippm-qoo.
100% QoO = improving the network more is unlikely to be noticeable for that app.
0% QoO = that app is likely to feel unusable under load.
For each app class, we compare your measured p95 latency, packet loss, and throughput to app-specific targets, then combine them with transparent weights.
Standards mapping: High = NRP (good target), Low = NRPoU (poor threshold), following IETF QoO terminology.
In each row, the marker shows your measured value versus Good/Bad ranges, and the CDF chart shows where your latency distribution sits.
| App class | Phase | Bad (minimum) | Good (target) | Ranges Good Bad Measured | Latency CDF Good Bad |
|---|
What is LibreQoS?
About the projectLibreQoS is network Quality of Experience (QoE) software for ISPs and network operators. It combines topology-aware CAKE traffic shaping with passive monitoring of latency, retransmits, throughput, and utilization to reduce bufferbloat and keep real-time apps responsive under load. Learn more at libreqos.io.
What Can I Do About Bufferbloat?
Next steps🔧 Router Solutions
Consider routers with built-in bufferbloat mitigation like Eero, Firewalla, MikroTik, or Alta Labs.
📞 Contact Your ISP
Share your test results with your Internet Service Provider. They may be able to adjust settings or upgrade equipment to reduce bufferbloat.