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UniFi Wi-Fi
Most "slow Wi-Fi" is not slow Wi-Fi. It is a WAN problem, a backhaul problem, a client problem, or a bandwidth cap somebody set two years ago. The diagnostic ladder below exists to find that out cheaply, in that order, before touching radios. Radio changes are the most disruptive and the most often wrong.
The diagnostic ladder
Run it top to bottom. Each rung eliminates a layer, and the failure that motivated this skill was only visible at the last rung.
1. Rule out the WAN. Trigger a gateway-side speedtest, which measures the gateway to the internet with no Wi-Fi involved:
This is the opening of the README. Read the full README on GitHub.