Stream Delay Calculator
Estimate total viewer delay by adding up encoder delay, network latency, platform buffering, player startup time, and optional moderation delay.
Total delay breakdown
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Get NordVPN →How the calculation works
The total delay a viewer experiences is the sum of several independent stages:
- Encoder delay: Time for OBS/Streamlabs to encode a frame. Faster presets reduce this.
- Network delay: Time to upload the encoded stream to the platform CDN.
- Platform buffering: The platform adds buffer to smooth playback. Ultra low latency reduces this to ~0.5s; normal latency can be 6–10s.
- Player startup: The viewer's player buffers a few seconds before starting playback. This varies by player and browser.
- Moderation delay: Some streamers add intentional delay to allow chat moderation before viewers see potentially problematic moments.
Frequently asked questions
What is ultra low latency on Twitch?
Ultra low latency reduces Twitch's platform buffer to roughly 0.5–1 second at the cost of slight quality reduction during bitrate spikes. It's ideal for interactive streams where you want to respond to chat quickly.
Why is there delay even at ultra low latency?
Encoder delay, network delay, and player startup time still add up even with minimal platform buffering. A realistic floor is about 1–3 seconds total even in ideal conditions.
Can I have zero delay?
Not with standard streaming protocols. If you need near-zero latency (e.g., for a game show with remote players), look into WebRTC-based tools, but those require specialized infrastructure and won't work with standard stream setups.
Why add moderation delay?
Some streamers stream IRL or play games that occasionally show spoilers, personal information, or controversial content. Adding intentional delay (10–60 seconds) gives moderators time to cut the stream if needed before most viewers see it.
How do I enable ultra low latency on Twitch?
In your Twitch Creator Dashboard, go to Settings → Channel → Latency Mode → select Ultra Low Latency. Note: ULL requires your bitrate to be stable. Unstable connections see more buffering at ULL than at normal latency because there's less buffer to absorb spikes.
What's the difference between Twitch's three latency modes?
Normal latency (~6–10 seconds) gives the best quality and is most tolerant of connection instability. Low latency (~3–5 seconds) balances interactivity and quality. Ultra low latency (~1–2 seconds) is ideal for chat-interactive streams but amplifies the impact of dropped frames. Most streamers should use Low Latency as a default.
Does YouTube support low latency streaming?
Yes — YouTube Live offers 'Normal latency' (~20–30 seconds), 'Low latency' (~5–10 seconds), and 'Ultra low latency' (~2–3 seconds). Set this in YouTube Studio → Go Live → Stream Settings → Latency. YouTube's ULL is higher floor than Twitch's but more stable on variable connections.
Why do my friends see the stream before other viewers?
Viewers closer to the streaming CDN edge nodes see the stream with slightly less delay. CDN delivery isn't perfectly simultaneous — a viewer in your city may be 1–2 seconds ahead of one across the world. This is rarely noticeable but can cause confusion in tournaments or quiz streams.