Workaround for Cortana high background usage in Windows 10 Mobile 10549

Staff Writer

Microsoft has just announced the Windows 10 Mobile insider build 10549. Alongside the Cortana improvements, namely bringing the digital assistant to insiders to Japan, Australia, and Canada in English, in this build Cortana also has remnants of a few nasty bugs.
According to a tweet from Gabe Aul:

In certain fringe cases, Cortana’s background usage can get very high, stealing much need system resources from the phone. Aul indicates that the team is working on a fix.

Meanwhile, the only way to work around this issue is to turn Cortana off.