There was a lot of contention when Cortana was being integrated into the start menu directly. They have very temperamental performance tests for first paint on the start menu open. Cortana caused their 250ms (or something to that number) first paint time limit to exceed to over 5 seconds for first paint. After enough grumbling, they eventually decoupled Cortana from the start menu directly. Thankfully.
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There was a lot of contention when Cortana was being integrated into the start menu directly. They have very temperamental performance tests for first paint on the start menu open. Cortana caused their 250ms (or something to that number) first paint time limit to exceed to over 5 seconds for first paint. After enough grumbling, they eventually decoupled Cortana from the start menu directly. Thankfully.