It's one of the most common internet complaints: the speed test shows far less than the plan you pay for. Before you assume your ISP is cheating you, know this — the advertised number is "up to," not "guaranteed," and several ordinary things sit between that number and what your device reports. Some are normal; some are fixable.
Normal reasons your speed looks lower
A few factors legitimately shrink the number without anything being wrong:
- Wi-Fi overhead — testing over Wi-Fi almost always reports less than a wired test because the wireless link has its own limits and losses.
- Plan structure — most residential plans are asymmetric, so upload is intentionally far below download.
- Peak hours — evening congestion temporarily lowers speeds for everyone in your area.
- Device limits — an older phone or laptop may not be able to use your full speed.
How to tell a normal gap from a real problem
The test is simple: measure on a wired Ethernet connection, with background apps closed, at a quiet time of day. If your wired result is close to your plan (roughly within 70–80%), the gap is almost certainly Wi-Fi or devices — see Wi-Fi, Router & Home Network. If even a wired, quiet-hours test is consistently well below your plan, that's a real issue worth investigating. For the testing setup itself, read how to test accurately.
What to do about a real shortfall
If a wired test confirms you're not getting your plan's speed, work through the slow internet guide: restart your modem and router, check cables, and rule out your own equipment. If it persists and looks time-based, congestion or throttling may be involved — see ISP Throttling, Peak Hours & Congestion. Documented, repeated wired tests are your best evidence when you contact your ISP or check your rights with the regulator.
This is part of our complete guide to testing and fixing your internet speed.
Frequently Asked Questions
Usually Wi-Fi. Test on Ethernet with background apps closed. If wired matches your plan, the gap is your wireless — not your ISP.
On a wired connection, getting within roughly 70–80% of the advertised speed is typical. Consistently far below that — even wired and off-peak — warrants investigation.
No. "Up to" describes the maximum under ideal conditions, not a constant. Real speeds vary with congestion, your equipment, and how you test.