Free Bufferbloat & Internet Speed Test
A 3-phase browser diagnostic that measures speed, ping, packet loss, and bufferbloat in one run — no downloads or apps required.
▶ Run the Free TestWhy bufferbloat matters: A standard speed test only measures throughput. Bufferbloat is invisible to throughput tests — your download speed can show 400 Mbps while gaming is completely broken due to buffer saturation in your router. This tool reveals the gap between idle latency and loaded latency, giving you an A–F grade that reflects real-world performance.
Fiber connections from AT&T, Google Fiber, and Verizon Fios almost always grade A or B because symmetrical upload/download speeds prevent the buffer saturation that causes bufferbloat on cable. If you're grading D or F, see our fiber internet guide to compare upgrade options.