App perform very very slow when image loaded from camera in framework7 V2

In framework7 V2, I am facing very serious issue, when image load from camera in image box or div background, application goes stuck keyboard not come on screen, sometime app goes hang. i dont know where i am wrong because same thing is working very smoothly in framework7 V1. another thing is my app almost developed but i am planning to convert entire app to framework7 V1. please help me.