🚦 Bufferbloat Test
The SolversPro Bufferbloat Test is a free, browser-based network diagnostic tool that compares your unloaded idle ping against your loaded latency during active download and upload traffic, assigning an A+ to F bufferbloat grade.
Measures Idle Ping → Download Load → Upload Load (~15 seconds total)
Latency Under Load Timeline
Teal = Idle · Blue = Download Load · Orange = Upload Load
Measure Mbps throughput on our Speed Test or run a 50-probe ping stability check on our Network Jitter Test.
Bufferbloat Grade Scale & Real-World Impact
Industry-standard bufferbloat grading based on the latency increase (loaded ping minus unloaded ping) during bandwidth saturation.
| Grade | Latency Increase | SQM / Queue Health | Gaming & Video Call Experience |
|---|---|---|---|
| A+ | < 5 ms | Optimal (CAKE / FQ-CoDel active) | Zero lag spikes even during 4K downloads or cloud backups |
| A | 5 – 30 ms | Very Good | Smooth gaming and clear VoIP calls under normal household load |
| B | 30 – 60 ms | Moderate | Occasional jitter spikes when multiple devices saturate bandwidth |
| C | 60 – 200 ms | Elevated Bufferbloat | Noticeable rubber-banding and voice delay during downloads/uploads |
| D | 200 – 400 ms | Severe Bufferbloat | Frequent game disconnects and frozen video conferencing |
| F | > 400 ms | Critical Queue Saturation | Real-time apps unusable when the line is busy; SQM/QoS needed |
Frequently Asked Questions
What is bufferbloat?
Bufferbloat is a spike in network latency (ping) caused by oversized packet queues inside routers or modems when your internet connection is under heavy download or upload load. Even on fast fiber or cable plans, bufferbloat makes gaming, video calls, and web browsing feel sluggish whenever another device downloads or uploads large files.
What is a good bufferbloat grade?
A grade of A+ (under 5 ms latency increase under load) or A (under 30 ms increase) means your router manages queues cleanly for real-time gaming and VoIP calls. Grades C through F (60 ms to 400+ ms latency spikes) indicate significant bufferbloat that causes lag spikes during simultaneous traffic.
How does the SolversPro Bufferbloat Test work?
The test runs in three automated phases against Cloudflare's edge network: first measuring your idle (unloaded) latency baseline, then measuring ping while saturating your download link, and finally measuring ping while saturating your upload link. Your grade is determined by the worst-case latency increase under load.
How can I fix high bufferbloat on my router?
The most effective fix for bufferbloat is enabling Smart Queue Management (SQM) such as CAKE or FQ-CoDel in your router settings, or configuring QoS bandwidth limits to roughly 85-90% of your maximum download and upload speeds so packets do not pile up in your ISP modem's buffer.
Share & Embed
Paste this snippet into your blog, school portal, or website to embed the live Bufferbloat Test — Loaded Latency & Router Lag:
<iframe src="https://solverspro.com/network/bufferbloat-test/?embed=1" width="100%" height="620" style="border:1px solid #27272a;border-radius:12px;background:#0a0a0f;" loading="lazy" title="Bufferbloat Test — Loaded Latency & Router Lag — SolversPro"></iframe> <p style="font-size:12px;margin-top:6px;font-family:sans-serif;">Powered by <a href="https://solverspro.com/network/bufferbloat-test/" target="_blank" rel="noopener">Bufferbloat Test — Loaded Latency & Router Lag — SolversPro</a></p>
<a href="https://solverspro.com/network/bufferbloat-test/" target="_blank" rel="noopener">Bufferbloat Test — Loaded Latency & Router Lag — SolversPro</a>
Similar Tools
Internet Speed Test
Accurate, real-time internet speed test powered by Cloudflare edge. Measure download, upload, ping, jitter, and bufferbloat.
Explore →Network Jitter Test
Measure real-time network jitter, ping stability, min/max latency, standard deviation, and packet loss directly in your browser.
Explore →IP Subnet Calculator
Calculate network address, broadcast, subnet mask, host range, and usable hosts for any IPv4 subnet using CIDR notation.
Explore →