Bufferbloat Test
See how your connection holds up under real load. Detects hidden lag that causes stuttering in games, video calls, and streaming — even on fast connections.
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Latency
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Jitter
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Network Quality Grade
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Not Tested
Run the test to see how your connection handles congestion.
How the test works
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Phase 1 · Saturates your download
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Phase 2 · Saturates your upload
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Phase 3 · Compares latency before & during load
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Grading Scale
A
Excellent0–5 ms increase
No bufferbloat. Perfect for gaming, video calls, and remote work.
B
Good6–30 ms increase
Minimal bufferbloat. Slight lag under heavy load, generally fine.
C
Fair31–60 ms increase
Moderate bufferbloat. Noticeable lag during large downloads.
D
Poor61–100 ms increase
Significant bufferbloat. Games stutter and calls drop. Enable SQM.
F
Bad100+ ms increase
Severe bufferbloat. Gaming and video calls will be very difficult.
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How to fix a poor score
Got a C, D, or F? Most bufferbloat issues can be solved by adjusting a few settings on your home router.
settings_suggestEnable SQM / CAKE
Look for 'SQM', 'CAKE', or 'fq_codel' in your router settings. This is the #1 fix for bufferbloat.
settings_input_componentSet a QoS bandwidth limit
Cap your router at 90–95% of your actual speed. This stops your modem's buffer from filling up.
routerUpgrade your router
ISP-provided routers often have poor buffer management. A modern router with a faster CPU helps significantly.