Internet Quality Test

[TheOracle]

I have build a Internet Quality Test tool.

A speed test tells you how many Mbps you get; this tool test tells you whether your line actually holds up when it gets busy. It measures your latency on a quiet line, then again while deliberately saturating your download and upload, and grades the difference, called bufferbloat, from A+ to F.

Anyone interested can have a look here:

Internet Quality & Bufferbloat Test (South Africa)

Free internet quality test for South Africa. Measure bufferbloat, jitter and latency under load in your browser and see if your line handles calls and gaming.

southafricafacts.co.za

 

[Mzezman]

Looks good - you're building up quite a nice set of tools there

 

[ponder]

Why is it that I get horrible latency under no load and atrocious latency under load with an F score, yet on waveform & libreqos I get A+ scores? In a real-life scenario with the link being hammered there's no noticeable increase in latency either.

 

[TheOracle]

Why is it that I get horrible latency under no load and atrocious latency under load with an F score, yet on waveform & libreqos I get A+ scores? In a real-life scenario with the link being hammered there's no noticeable increase in latency either.

A few things could explain it.
My idle probes and the saturating downloads all share one connection to Cloudflare, so any queueing that only shows up when everything's funnelled through a single connection will hit my test but not tools that spread load across multiple flows. It's also all timed in the browser's JS thread, so if your CPU is busy chewing through four parallel downloads, that can skew the probe timing itself, separate from actual router queueing. And LibreQOS measures at your ISP's edge, so it won't catch congestion further out on the path to Cloudflare specifically.

None of these tools are the final word alone, but an F with zero real-world impact points at the Cloudflare path rather than your line.

What's your setup, fibre or LTE, which router, any VPN running? Keen to dig into it properly.

 

[Mzezman]

Why is it that I get horrible latency under no load and atrocious latency under load with an F score, yet on waveform & libreqos I get A+ scores? In a real-life scenario with the link being hammered there's no noticeable increase in latency either.

Wired or WiFi?

 

[ponder]

What's your setup, fibre or LTE, which router, any VPN running? Keen to dig into it properly.

Cudy wr1300, openwrt 25.12.5, sqm qos, no vpn,, fibre, linux pc via ethernet with idle cpu & network usage.

In general network is running great, just found those test results weird as they don't align with anything else.