What is TTFB by browser
TTFB by browser shows the Time to First Byte (TTFB) across different browsers (e.g. Chrome, Safari, Firefox). This lens helps you understand whether certain browsers experience slower server responses — often due to differences in how requests are formed, cached, or routed.
Only browsers that generated traffic to your website during the selected period will appear.
TTFB reflects the time between a user initiating a page load and the browser receiving the first byte from the server. It’s a crucial metric that sets the pace for the rest of the page load — including LCP and INP.
Healthy TTFB by browser sample
Should you worry
A healthy TTFB by browser lens is all green. Minor fluctuations are expected, but significant differences in TTFB between browsers can hint at issues with caching, server behavior, or third-party scripts loading differently depending on the browser.
Unhealthy TTFB by browser sample
In the example below, Chrome is both the most used and the slowest browser in terms of TTFB. That’s problematic — especially since most users are likely on Chrome. It could be caused by unoptimized server logic, missed cache opportunities, or region-specific slowdowns tied to how Chrome makes requests.
Slower TTFB means users wait longer before any part of the page starts loading — increasing bounce risk and killing conversion rates.
Resolving unhealthy TTFB by browser
Go-to action plan to resolve an unhealthy TTFB by browser:
Ask Uxi to analyze your TTFB by browser values and suggest improvements.
Use Filters to isolate the slow browser, then cross-reference it with TTFB by page, TTFB by country, or TTFB by device to narrow down the root cause.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by browser. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by browser 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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