Wi-Fi on my Mac is terribly slow, even though everything works fine on other devices. I can’t figure out if this is a macOS glitch, a router glitch, or just karma? Where should I start checking to avoid breaking everything completely and without turning into a network engineer?
First step: figure out whether your MacBook is actually the problem, or if it’s just the device you happen to notice it on the most. Same room, same network, different device. If the MacBook is clearly worse, then yeah, start looking at the Mac side. If everything sucks there, then congratulations, it’s just your WiFi.
Common and boring reasons: a bad channel, a weak signal where you’re using it, too much noise/interference, or your MacBook is running longer than it should on a weak band/access point. People like to immediately blame the internet service provider, but half the time the problem is simply the wireless connection.
@SecurityMan_N Is there a Mac-friendly tool that actually makes this easier to see?
Try NetSpot — it’s a classic for Macs. It’s great because it shows not only signal strength but also noise (interference) levels. It often happens that antennas show maximum signal strength, but the internet is slow precisely because of all the interference. This tool works most accurately on MacBooks.
@SecurityMan_N So, if there’s a high noise level in the areas where the Mac is slow, then something is “jamming” it, not just the signal not getting through?
Exactly. If the noise is off the charts with a normal signal, it means the airwaves are simply clogged with neighbors or microwave ovens. So instead of randomly changing settings, first check the noise level and available channels in the areas where the internet is dropping.