Cost and speed
The Most Expensive Milliseconds Are Unmeasured
Our short summary of Expedia’s engineering write-up. The full story, with all the detail, is on their blog.
Read the full write-up on medium.com (opens in a new tab)Problem
Users felt login screens were slow, eroding trust without obvious errors.
Solution
They created a new metric, Native Time to Interactive (NTTI), to measure when key screen components load and become usable, turning performance into a first‑class signal.
Want the architecture, code and numbers? They’re in the original post.
Read the full write-up on medium.com (opens in a new tab)