Test both download and upload speed — upload matters more for video calls and cloud uploads than most people realise — and check for latency or jitter if video calls regularly freeze or lag. A wired ethernet connection to the router, even for a few key hours of the day, often solves problems WiFi alone can't.
Coach's tip: run a speed test at the same time you're actually struggling, not first thing in the morning when the connection is quietest.
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