Real-world performance expectations
ISPs advertise 'up to' speeds that represent theoretical maximums under ideal conditions. Actual speeds depend on multiple factors. Here's what you'll realistically experience with fiber vs. cable.
When AT&T advertises '1 Gig fiber,' they mean the maximum possible speed is 1000 Mbps download and 1000 Mbps upload under ideal conditions with a wired connection. Wi-Fi, device capabilities, and network congestion all affect what you actually experience.
Fiber typically delivers 80–95% of advertised speeds consistently. On a 500 Mbps fiber plan, expect 400–480 Mbps via wired connection and 200–400 Mbps on Wi-Fi depending on your router's capability and distance from the router.
Cable delivers 60–80% of advertised speeds on average, dropping to 40–60% during peak hours (7–10 PM weekdays). This congestion effect is built into the shared cable network architecture and doesn't exist with fiber.
Use speedtest.net or fast.com to measure your actual speeds. For an accurate reading: connect via Ethernet cable (not Wi-Fi), close other applications, and run the test 3 times at different times of day. Compare peak-hour results to off-peak results — the gap tells you how congested your cable network is.
The biggest limiter of home internet speed is often the Wi-Fi router, not the internet connection. Even on a 1 Gig fiber plan, an older 802.11n router might only deliver 150 Mbps wirelessly. Wi-Fi 6 and 6E routers are recommended for households on gigabit plans.
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