Measure the transition rather than guessing
Choose two permitted channels and note the approximate time from selection to useful picture and sound. Repeat a small number of times without rapidly cycling through dozens of entries. Rapid requests can create a different workload and may encounter service limits.
Record whether the first change after opening the app is slower than later changes. Also note whether the delay occurs for every channel or only a particular format or group. Those distinctions help support reproduce the behaviour.
Look for a format transition
A change can require the player or display to handle a different resolution, frame rate or audio format. A brief blanking period caused by a documented display-format switch is not identical to a network loading indicator.
Keep the display path in mind if you use a receiver or soundbar. Do not change output settings blindly. Compare the player’s visible loading state with what the television reports, and consult the exact equipment’s guidance if a format change is involved.
Separate account and network questions
An account or playlist problem can prevent a new item from opening even while an already running item continues. Loading the channel list does not prove that every listed media request is available. Note any exact error instead of repeatedly re-entering credentials.
If all transitions are slow, compare the same player on a suitable wired path where available. If one channel alone is slow, report that narrower result. A high general speed-test number cannot settle every stream-opening question.
Avoid fixes that create a new problem
Do not increase every buffer setting or repeatedly clear app data just to reduce channel-change time. One may increase startup waiting; the other can remove configuration. First identify which stage is slow and use a documented, reversible change.
A good report includes player version, two example channels, approximate transition times and whether picture and audio arrive together. Keep account URLs and customer identifiers private.
Questions about this guide
Does a slow channel change prove the stream will buffer?
No. Startup and sustained playback are different behaviours. Record both separately.
Should I cycle through channels faster to test them?
No. A few controlled comparisons are more useful and avoid creating an artificial burst of requests.