What is INP by browser timezone
INP by browser timezone shows the Interaction to Next Paint (INP) grouped by the user’s local browser timezone — typically matching their geographic region. This lens helps you detect whether interaction delays are region-specific, even without precise geo data.
Only timezones with actual user activity during the selected window will be included.
🕒 This lens uses the browser’s timezone setting, not IP geolocation. That makes it privacy-respecting but still geographically useful for tracking regional UX issues.
Why it matters: INP is highly sensitive to both frontend responsiveness and server timing. Slower INP in specific timezones can point to overloaded servers, unoptimized region-specific scripts, or high input latency caused by laggy content.
Healthy INP by browser timezone sample
Should you worry
In a healthy chart, most browser timezones stay green. Minor deviations are expected — especially during peak hours or in regions with older devices — but they shouldn’t drift into yellow or red.
This typically means:
Your server or CDN is responsive worldwide.
Input delays aren’t creeping up in specific regions.
Your frontend isn’t regionally bloated (e.g. translation layers or ad scripts).
Unhealthy INP by browser timezone sample
When INP varies significantly by timezone, consider:
Slow INP in Asia-Pacific: Could suggest JavaScript bundling or slow third-party services not optimized for those regions.
High INP during US working hours: Might be a result of high traffic + heavier client-side workloads.
Localized UX features: Region-specific content or features could be less optimized or tested.
Watch for timezones that persistently underperform, even with moderate traffic — that’s usually a signal worth investigating.
Resolving unhealthy INP by browser timezone
Go-to action plan to resolve an unhealthy INP by browser timezone:
Ask Uxi to analyze your INP by browser timezone values and suggest improvements.
Filter down to the timezones in red, and cross-check device types, interactions, and layout structure.
Simulate INP of the suspected lens to see if fixing it will resolve the INP by browser timezone. If yes, this is where the resolution focus should be.
Use an automated INP optimization tool like INProve to improve your INP by browser timezone values.
Once you’ve improved INP, set an alert to be the first to know if it starts worsening again.
Try it yourself
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