expertAPI Design, Performance & Resilience
An API works perfectly with 100 concurrent users but times out at 10,000, even though CPU sits at only 40%. Why?
Tests whether you know low CPU with high failure at scale usually points to thread pool or connection pool saturation, not compute.
This is a Pro question
Sign in, then upgrade to Pro or Power to unlock this question and the full Interview Prep bank.
An API works perfectly with 100 concurrent users but times out at 10,000, even though CPU sits at only 40%. Why?