java - Why do separate loops run faster than one loop that does multiple things?

My game had some lag, so I tried to improve the performance.

I found that if I write my loops separately like this:

for (...){
    for (...){

        // Do operation A 
        // (Fill int[][] with 1s)
    }
}

for (...){
    for (...){
        // Do operation B 
        // (Work with Sprite Renderers & Spritebatch)
    }

}

for (...){
    for (...){
        // Do operation C
        // (Work with Shape Renderers with alpha)
    }
}

then the result runs a whole lot faster than if I try to do all the operations in one loop:

for (...){
    for (...){
        // Do operation A 
        // Do operation B
        // Do operation C
    }
}

Can anyone explain this?

I'm running this game on Android OS!

Answer

After some deep research and a lot of testing finally found out that the problem wasnt the loop as because it works on a simple maths. but the problem was in the rendering batch, the more batch there is, java will likely to share more memory to each batch as because batch is a collection of vertices. i divided them because i have to batch.begin() and batch.end() every batch, and it runs better. thanks all in helping me today. P.s sorry for bas english XD