What is TTFB by browser language
TTFB by browser language shows the Time to First Byte (TTFB) segmented by the user’s browser language preference.
Even though TTFB is mostly driven by server behavior, it can be influenced by language-specific factors like:
Server-side rendering for different locales
Redirections based on language
Language-specific CDNs or third-party endpoints
Only languages with active user traffic are shown.
🌍 Browser language is a strong signal for user intent and location — making this lens ideal for spotting regional backend performance issues without needing full geo data.
Healthy TTFB by browser language sample
Should you worry
In a well-optimized setup, TTFB remains green across all browser languages. This means:
Server logic handles all language paths equally well.
No excessive redirects or SSR bottlenecks per language.
CDN and caching strategies are equally effective for all locale variants.
Unhealthy TTFB by browser language sample
If TTFB is high for a specific language:
You might be missing edge cache coverage for that locale.
There could be redirect chains (e.g.
/→/en/→/en-US/) delaying response.Dynamic content (localized prices, promotions, or banners) could be skipping cache.
Language-specific third-party requests (e.g. regionally targeted ads or scripts) may slow initial server response.
Resolving unhealthy TTFB by browser language
Go-to action plan to resolve an unhealthy TTFB by browser language:
Ask Uxi to analyze your TTFB by browser language values and suggest improvements.
Filter to correlate with server region, device, or path structure.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by browser language. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by browser language 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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