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Supersonic speed test

Test your Supersonic fibre or Air Fibre connection and see whether it matches your package.

Supersonic Air Fibre runs on MTN’s 5G and LTE towers, so put the router at a window before testing. Fibre customers should test on a cable for a true line reading.

What speed is normal on Supersonic?

Supersonic is MTN’s home internet brand. It sells fibre over operators such as Vumatel, Openserve and Frogfoot, and Air Fibre, which is fixed 5G and LTE on the MTN network. Fibre results track the package; Air Fibre results depend on signal and tower load.

Supersonic product	Typical download	Typical ping	Good for
Fibre up to 100 Mbps	Within about 10% of package	3–15 ms	HD and 4K streaming, calls
Fibre 200 Mbps – 1 Gbps	Within about 10% on a cable, less on WiFi	2–12 ms	Working from home, families, downloads
Air Fibre 5G	80–400 Mbps	12–35 ms	4K streaming, working from home
Air Fibre LTE	15–70 Mbps	25–60 ms	Browsing, HD streaming, calls

Air Fibre ranges assume a good signal with the router at a window. Uncapped Air Fibre plans have fair-use terms that can reduce speed after heavy use.

Rule of thumb: fibre under 80% of package on a cable is a fault. Air Fibre at 50–80% of your best daytime result is normal at peak.

Why your Supersonic speed is slow, and what to do about it

Find out whether the problem is WiFi, signal, the line or the ISP.

Test on a cable, not WiFiPlug a laptop into the router with an Ethernet cable and test again. If the cable result is much higher than WiFi, the problem is inside your home, not with your provider. Move closer to the router, switch to the 5 GHz WiFi band, or add a mesh unit.
Reposition the Air Fibre routerMove it to a windowsill on the side facing the nearest MTN tower, as high as possible. Check the signal bars in the router page after moving it.
Check the ONT lights (fibre)A red LOS light means the line is down and the fibre operator must repair it. Normal lights with slow speed point to WiFi, the router or the ISP.
Confirm your package and any capLog into the Supersonic app and check the package speed and, for Air Fibre, whether a fair-use cap has applied.
Test at a quiet hour and at peakRun the test at 10 am and again at 8 pm. A big evening drop points to congestion on the network, not your setup. A steady shortfall at every hour points to the line or the plan.
Restart the routerSwitch it off at the wall for 30 seconds. Routers that have been on for weeks leak memory, drop to slower WiFi modes and hold onto poor connections. Do this before anything else.
Contact Supersonic with your numbersIf daytime speeds on a cable are still far below your plan, use the Supersonic app, WhatsApp or the support line. Send the download, upload and ping numbers, the time of day and whether you were on cable or WiFi. That gets you past the first-line “restart your router” reply.

Air Fibre vs fibre: which should you be on?

If fibre is available at your address, it is almost always the more consistent choice: no signal issues, no peak-hour tower congestion, and it keeps working through load-shedding on a small UPS. Air Fibre 5G is the right pick where fibre has not arrived, and in strong 5G coverage it can match a 100–200 Mbps fibre line.

Common questions

Why is my Supersonic Air Fibre slow?

Signal and congestion. Move the router to a window, check the bars, and compare a daytime test with an evening one before contacting Supersonic.

What speed should Supersonic fibre give me?

Within about 10% of your package on a cable. WiFi results will be lower on faster packages.

Does Supersonic throttle Air Fibre?

Uncapped Air Fibre plans have fair-use terms that can reduce speed after heavy monthly use. Fibre is not throttled.

Which network is Supersonic on?

Fibre runs over operators such as Vumatel and Openserve; Air Fibre runs on the MTN 5G and LTE network.

Test by provider

Guides: WiFi speed test Fibre speed test Ping test