Installing updates on Windows is often treated as a joke because of the many times it can require, or insist, on a restart and how long the process can take. In an effort to tackle the latter for feature updates, like the Creator's Updates Windows 10 has received, Microsoft has shifted parts of the update process around to reduce the amount of 'offline' time, which is the time the computer cannot be used by the user, bringing the average offline time down to 30 minutes, compared to the Creator's Update average of 82 minutes and Fall Creator's Update average of 51 minutes.
As explained at the source link, there are multiple steps involved with installing feature updates, and some of these are done in the background while the user is working and others are done when the operating system is not running. Under the older model steps such as migrating user content and placing the new operating system into a temporary working directory were done during the offline phase, but with the new model these tasks are done in the online phase. This means the online phase will be longer, but as the processes involved run at a low priority in the background, neither performance nor battery life should be impacted much. The result is still less disruption to the user's work as the offline time will be significantly less than it has been before.
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