Why is my mobile is SLOW every time?

"Hi,

Do you have this problems from the beginning?

First you can do a factory reset, but if you have important data, make a backup first, because this will erase all your personal data.

How to Wipe Samsung Galaxy S4 Data / Factory Reset

This will resolve your problem if it's from an application or settings.

Do a SW update.

If you have same problem after this steps, then the problem is HW.

From your explanation I thing you can have a problem with the camera, but I can't be sure.

Regards."

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With low processor speed, you may check any unnecessary installed applications and remove.

"yes

my phone is all time can be slow"

reset the phone to the factory setting is the only solution for software change in the smart phone please ,try this method and if it does not work we will try other method after ur feedback