This video is about a quick speed comparison between Windows Phone 8.1 and the latest Windows 10 Mobile Insider Preview Build Microsoft has released so far - Build 10512.\r
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Be aware of the f that Windows 10 Mobile is currently in PREVIEW STATE and NOT FINISHED yet. This speed comparison should only show you how far Microsoft did come so far with Windows 10 Mobile, so do not be surprised if Windows Phone 8.1 is currently the more fluent and stable OS since the release of Windows 10 Mobile is expected to happen in November and therefor the company still has some time to work on their next gen mobile operating system.