What is TTFB by device brand
TTFB by device brand shows how Time to First Byte (TTFB) varies across known device categories like iPhones, Windows PCs, Androids, or Linux desktops.
Even though TTFB is mostly a server-side metric, device-level variations can emerge from:
Poor connections on mobile devices
Slow DNS or TLS handshakes on older operating systems
Network throttling or inefficient request logic tied to specific environments
This lens helps uncover delivery gaps that disproportionately affect certain hardware.
Healthy TTFB by device brand sample
Should you worry
If your site is optimized:
Most brands, especially desktops and high-end phones, show fast TTFB
Some mobile variance is expected due to mobile network jitter or latency
No major group shows consistent yellow or red — even when used in weaker environments
This means your edge delivery, CDN routing, and server response logic are in good shape.
Unhealthy TTFB by device brand sample
If certain device brands show poor TTFB:
Android phones on budget hardware may suffer from slow DNS resolution or weak network stacks
Windows or Linux desktops may lag due to outdated browsers or lack of HTTP/2/3 support
Older iPhones might struggle with TLS handshakes or caching misconfigurations in Safari
You could also have a server-side logic path that treats some user agents differently — or fails to cache aggressively
The result? Slower first byte delivery for specific chunks of your audience — which cascades into slower LCP and INP too.
Resolving unhealthy TTFB by device brand
Go-to action plan to resolve an unhealthy TTFB by device brand:
Ask Uxi to analyze your TTFB by device brand values and suggest improvements.
Filter to isolate slow TTFB sessions and find hidden patterns.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by device brand. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by device brand values.
Once you’ve improved TTFB, set an alert to be the first to know if it starts worsening again.
Try it yourself
Discover how your website performs with real user data.