Some of the slowdown should have been noticed by QA. But most of this slowdown occurs when you have used your machine for long enough to accumulate 4 MB of File

Some of the slowdown should have been noticed by QA. But most of this slowdown occurs when you have used your machine for long enough to accumulate 4 MB of File Explorer history. Telemetry is the perfect tool for catching this sort of real in-the-field problem. More QA is also important.