Guide
How to test for bufferbloat on Android TV (and fix it)
Your speed test says 500 Mbps, yet games lag and video calls stutter whenever someone starts a download. That is usually bufferbloat: latency that explodes when the line is busy. Here is how to measure it from your TV and fix it.
What bufferbloat is
Routers and modems hold packets in a queue when more data arrives than the line can send. Small queues are fine. Oversized queues fill up during a big download or upload, and every packet, including your game input or the next second of a video call, waits behind them.
The result is a connection that measures fast but feels slow: idle ping might be 15 ms, but it jumps to 300 ms or more as soon as the line is saturated. A normal speed test reports the bandwidth and hides the problem; a bufferbloat test measures latency while the line is busy.
Why test on the TV itself
The TV or streaming box is the device that buffers, so its own connection is the one that matters. TVs often have weaker Wi-Fi than phones, sit further from the router, or use a 100 Mbit Ethernet port. A test on your phone next to the router can look perfect while the TV struggles.
AskIT Speed runs natively on Android TV and Google TV with the remote, measures download and upload one after the other, and reports idle ping, loaded latency, jitter and the server you reached.
Run the test
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Prepare the network
Pause big downloads, cloud backups and game updates on other devices. You want to measure the line, not someone else's download.
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Run a full test on the TV
Open AskIT Speed and start a test. It measures download first, then upload, and records latency while each one runs.
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Read idle against loaded latency
Look at the unloaded (idle) ping and the loaded latency. The difference between them is your bufferbloat. Check the upload figure too: on cable and DSL lines with slow upload, the upload direction is often the worst.
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Repeat at peak time
Run it again in the evening, when everyone streams. Congestion and bufferbloat are often worse then.
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Compare Wi-Fi and cable
If you can, test once over Ethernet and once over Wi-Fi. If only Wi-Fi is bad, the problem is the wireless link, not the line.
How to read the numbers
These are rules of thumb rather than hard limits, but they match how lag feels in practice.
- Under about 30 ms extra under load. Good. Games and calls stay smooth while others stream.
- 30 to 100 ms extra. Noticeable in fast games and live calls; worth tuning.
- More than 100 ms extra. Clear bufferbloat. Expect lag spikes and choppy calls whenever the line is busy.
- Jitter above about 30 ms. Delay varies too much; voice turns robotic and video calls freeze, even if speed is fine.
How to fix bufferbloat
- Turn on SQM. Smart Queue Management keeps queues short and fair. On OpenWrt it is the SQM package with the CAKE or fq_codel algorithm; some consumer routers call it Smart Queues or offer a mode optimised for gaming and conferencing.
- Set it a little below your speed. Set the SQM limits to about 85–95% of the download and upload speeds you measured. Giving up a little bandwidth is what keeps the queue in your router instead of the modem.
- Check the result. Run the test again. Loaded latency should now stay close to idle ping.
- Use a cable for the TV. Ethernet removes Wi-Fi variability. If your router cannot do SQM, a newer router that can usually fixes more than a faster plan.
- Schedule heavy transfers. Move cloud backups and big game updates to the night if you cannot shape traffic.
Frequently asked questions
Will a faster internet plan fix bufferbloat?
Not reliably. A faster plan makes the queue drain faster, but the oversized buffer is still there and still fills during big transfers. Queue management on the router is the real fix.
Is bufferbloat my ISP's fault?
Sometimes. It can come from the ISP's modem or network, but very often it is the home router. SQM on your own router usually fixes it either way.
Does SQM slow down my connection?
Slightly: you give up about 5–15% of peak speed so the router controls the queue. In exchange, latency stays low under load.
Why measure upload as well as download?
Upload is often the smaller pipe, so it saturates first: a photo backup or a video call can fill it and cause lag for everyone.
Is AskIT Speed free?
Yes. It is free, with no ads and no trackers, for Android phones, tablets, Android TV and Google TV.