What is TTFB by operating system
TTFB by operating system shows the Time to First Byte (TTFB) value across different operating systems (e.g., Windows, macOS, Linux). This lens helps you identify which operating systems are experiencing delays in receiving the first byte from your server.
The list includes only operating systems that generated traffic to your website during the selected period.
A common reason for slower TTFB on certain operating systems is regional or network-specific latency, DNS resolution issues, or routing inefficiencies—often seen more on Windows due to its presence on a broader variety of network configurations and devices.
TTFB represents the time it takes for the user’s browser to receive the first byte of data after making a request. It's a foundational metric that affects all others, especially LCP and INP.
Healthy TTFB by operating system sample
Should you worry
A healthy TTFB by operating system lens looks all green. Some operating systems may perform slightly better than others, but as long as there's no yellow or red, it’s considered healthy. The greener the OS, the faster users start loading your site.
Unhealthy TTFB by operating system sample
In the example below, TTFB by operating system shows that Windows users are experiencing the slowest server response times. This can result in noticeable delays, even before rendering begins — contributing to higher bounce and abandonment rates.
Resolving unhealthy TTFB by operating system
Go-to action plan to resolve an unhealthy TTFB by operating system:
Ask Uxi to analyze your TTFB by operating system values and suggest improvements.
Use Filters to isolate the slow OS in your TTFB by operating system, then cross-reference with TTFB by country and page to find systemic issues.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by operating system. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by operating system 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.