Bitrate is the actual technical proof of resolution, and it's harder to fake than a screenshot or a marketing paragraph describing a crisp picture. A channel labeled 4K can still be encoding at 1080p bitrates and simply upscaling the display internally, which looks close enough in a static screenshot but falls apart on a large screen the moment there's fast motion, like a sports broadcast or an action scene. A review that skips bitrate entirely is skipping the only number that actually settles the question, and most do skip it, because measuring it takes more effort than writing a sentence about how sharp the picture looked on a laptop screen.

Run a wired or close-range wifi speed test during the hour you'd actually watch, not at 3am when your entire network is idle and every other device is asleep. You need roughly 15 to 25 Mbps sustained for true 4K, not just as a brief peak number on a speed test app. HEVC encoding, a compression method that keeps picture quality steady while roughly halving the file size compared to older H.264 encoding, cuts that bandwidth requirement close to half, so a service using HEVC needs meaningfully less raw bandwidth to deliver the same picture you'd get from an older codec at full size.

A real test names the device it played on, whether the connection was wired or wifi, and how long the stream held without dropping frames or stalling during a live segment. It also mentions data use, since 4K runs about 7 GB an hour compared to roughly 3 GB an hour at 1080p, which matters directly if your home internet plan has a monthly data cap you're already close to. If a review skips all of that and only offers a general impression of picture quality, it's a marketing page with a resolution number attached to it, not a test anyone could repeat.

The VOD library runs 219,577+ titles across a 190+ country footprint, and streams use HEVC where the source supports it, which keeps the bandwidth requirement lower for the same delivered picture quality. Connections range 1 to 5 simultaneous streams by plan, which matters if more than one screen in the house is running 4K content at once, since that multiplies the total bandwidth your connection needs to sustain. None of that replaces your own test on your own line, but it's the kind of specific, checkable figure a real review should hand you instead of a vague adjective about clarity.