Unattributed Navigation Overhead (UNO) Is Underrated

· Harry Roberts · Aug. 19, 2026, 2:23 p.m.
web-performance Frontend Development Navigation Timing Cross-Origin Redirects
Summary
This blog post discusses Unattributed Navigation Overhead (UNO), focusing on aspects of Time to First Byte (TTFB) that Navigation Timing does not cover, particularly concerning hidden cross-origin redirects.
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