What is TTFB by screen orientation
TTFB by screen orientation shows the Time to First Byte (TTFB) by the screen’s orientation — portrait, landscape, or square — at the time the page was loaded. This lens helps reveal if viewport-related layout shifts or content strategies are affecting the initial connection and delivery timing.
Only orientations with actual traffic in the selected time window will appear.
Why it matters: While TTFB is mostly a network/server metric, orientation can sometimes reveal indirect performance issues — like how render-blocking content or server-side logic varies by layout. For example, a full-width hero image served only in landscape might delay HTML delivery.
Healthy TTFB by screen orientation sample
Should you worry
A clean TTFB view shows consistent performance across all orientations. Slight variation is fine, especially when different orientations imply different device types (e.g. tablets in landscape vs phones in portrait). As long as everything stays green — you’re good.
Unhealthy TTFB by screen orientation sample
When landscape TTFB is slower, consider:
Heavier above-the-fold content being generated on the server.
More critical resources or layout branches included in the response.
Conditional logic (like A/B tests or personalization) being triggered by orientation.
When portrait TTFB is degraded:
Server may be slower at rendering long vertical content or paginated feeds.
CMS systems may be generating alternate templates with more blocking logic.
Slow square TTFB is uncommon but can happen when:
Your backend fails to detect or support unusual aspect ratios.
Square viewports trigger fallback templates or extra redirections.
Resolving unhealthy TTFB by screen orientation
Go-to action plan to resolve an unhealthy TTFB by screen orientation:
Ask Uxi to analyze your TTFB by screen orientation values and suggest improvements.
Filter by orientation and look at origin response times vs cache effectiveness.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by screen orientation. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by screen orientation values.
Once you’ve improved TTFB, set an alert to be the first to know if it starts worsening again.
Try it yourself
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