One of the most common complaints about internet service is that actual speeds do not match what providers advertise. We analyzed the gap between advertised and measured speeds across different technology types.
Methodology
We compared the maximum download speeds reported by providers in publicly available broadband data (which represent what providers claim to offer) with aggregated speed test results from public measurement platforms. This allows us to estimate the typical ratio between advertised and delivered speeds.
Results by Technology
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Check My AddressFiber connections consistently deliver speeds closest to their advertised maximum. Typical fiber connections achieve 90-95% of the advertised speed, with many users reporting speeds at or above the advertised tier. Symmetrical upload speeds are another fiber advantage.
Cable connections using DOCSIS 3.1 technology typically deliver 80-90% of advertised download speeds during off-peak hours. However, performance can degrade significantly during peak evening hours due to shared bandwidth on the cable network.
DSL connections show the widest gap between advertised and actual performance. Many DSL plans advertise speeds of up to 100 Mbps but deliver significantly less depending on the distance between the customer and the central office.
Fixed wireless performance varies widely based on distance to the tower, line of sight conditions, and network congestion. While fixed wireless can deliver excellent speeds in ideal conditions, consistency is more variable than wired connections.
What Consumers Can Do
When comparing internet plans, consider the technology type alongside the advertised speed. A fiber plan advertised at 500 Mbps may deliver a more consistent experience than a cable plan advertised at 1 Gbps.
Use FiberFinder's speed test tool to measure your current connection, then compare against what other providers in your area are offering. If fiber is available at your address, it is almost always the most reliable choice for consistent speeds.