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Startup Boost FAQ
EDIT: We have an updated version of this FAQ over on the support site now. Head over the Get help with startup boost page to review the latest information about startup boost, including how to submit...
I've just installed Edge on this device, and the option is not available. I have Edge installed on multiple other devices, and the update came through to make it available recently. Do you know why it wouldn't even be an option with a fresh install?
It's most likely a staged rollout,
Progressive rollouts for Microsoft Edge Stable channel updates
https://docs.microsoft.com/en-us/deployedge/microsoft-edge-update-progressive-rollout
Progressive rollouts for Microsoft Edge Stable channel updates
https://docs.microsoft.com/en-us/deployedge/microsoft-edge-update-progressive-rollout