Speed Test Lower Than Your Plan Promises? Router Problem vs Plan Problem

You run a speed test, the number is well below what your ACT Fibernet plan promises, and you don't know whether to blame the router or call your ISP. This is a five-minute way to find out which one it actually is, before you do either.

The one test that isolates the cause

Run the same speed test two ways: once with a laptop connected directly to the router via an Ethernet cable, and once over wifi on the same device, standing close to the router.

If it's a wifi problem

The connection coming into your home is fine, so the fix is on your end. In order of how often this is actually the cause:

1. Too many devices, or heavy devices sharing 2.4GHz with everything else — check your device load
2. You're testing far from the router, or through concrete — this is a range issue, not a speed issue
3. Bands aren't split, and a heavy device is stuck on the slower 2.4GHz band by default
4. Old router that can't handle your plan's actual speed, even wired

If it's a plan or ISP problem

If even the wired test comes in below your plan speed, the shortfall is happening before your router sees the connection at all — no amount of router configuration will fix this. This is worth reporting directly rather than continuing to troubleshoot wifi settings that aren't the actual cause.

A common false alarm

Speed tests measure a moment in time and can vary by 10 to 15% run to run, especially at peak evening hours when everyone on your local network — and often your ISP's local infrastructure — is under more load. Run the test two or three times, at different times of day, before concluding there's a real problem.