A good feature gone bad.
According to reports, some are experiencing some high CPU utilization after installing the Windows 10 upgrade. A thread on Reddit, shows that many are experiencing this problem, which causes a laptop fan to spin constantly. If you're a Surface Pro 3 user, you've experienced fan noise before and know how annoying this can be. Additionally, if the fan is constantly spinning, it also means there's a chance that equipment is heating up – which is never a good thing for prolonged periods.
The Reddit thread also contains a fix. The fix is simple but is in an unlikely area.
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Tap or click the Notification Center icon in the Windows 10 system tray and tap or click All Settings.
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Tap or click the System icon (for display, notification, apps, power – and other things)
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Go to Notifications & Actions and deselect the "Show me tips about Windows" option.
Your CPU utilization should be back to normal.
I'm sure Microsoft is aware of this and is working on a fix.