This phone is prepared windows technology.
Now days most of the people used as android phones.When compared android windows is slow.
The performs windows better desktops and laptops.whenever compared to smart phones windows is not flexible.
Because of sometimes phone may be struck and suddenly slow.
when apps installation as slow.Nokia lumia 630 same category .
windows operating mobiles some confusing modules.
whenever android easy movement to understand.
Hence these type mobiles are slow type.