Camera is very slow to focus

I know it's late to ask this but i have this phone for quite a while now. Since brand new, i have always noticed that the camera auto focusing has been really really laggy and it gets worse under dimmer conditions. Touch to focus is a tad faster but then its not as great too. I used to have a iPhone 5 and it was a fast snapper and i rarely miss a shot with my active toddler around. With my note 3, most of the time i am missing moments even with him (my tod) being less active!

Is this merely due to software / OS or hardware limitations? Is there anyway to fix this ?

Please advise. :cowboy: