Plugging an adapter into a power strip or surge protector is the most common mistake. These devices are designed to filter out "noise"—but for a powerline adapter, the data is the noise , and the protector will actively strip it away.

Appliances with motors (vacuum cleaners, fans, washing machines) or AC adapters for phones and laptops create "noise" on the line. This interference can cause packet loss, which disproportionately slows down large download streams.

Experiencing a on a powerline adapter is a common but frustrating networking paradox. While we usually expect downloads to be faster than uploads, this specific "bottleneck" occurs when your internet's actual speed capacity exceeds the physical throughput limits of your electrical wiring. 1. The "Cap" Reality: Why Uploads Look Fast