I have Lumia 520 , Windows phone 8 used used to be very fast no lag no blank tiles , than popped in windows phone 8.1 and that charm lost not completely but still Windows phone started to Lag, add to it low quality apps that never gets updates fixes. Will Windows 10 fix this ?? Will the UI, Sorted settings menu , efficient utilization of screen space will be fixed by Windows 10, Data settings, Equalizer for all devices , Better notification center , the interactive lock screen ever come to Windows 10 what will happen if windows 10 won't bring SUPER MAJOR CHANGES will windows phone survive and the way Microsoft focusing on other platforms are we windows phone fans , users will be treated fairly. ????