Window size impact on collision checks?

Hi

I was playing around with simple collision checks and performance. When i came across following strange thing:

I had 800x500 window size with 1250x1250 layout size. I had 1 player sprite, bullet and around 200 wall sprite. I spawned bullets while a mouse button was down and checked bullet overlapping with wall sprites to destroy them. I had CPU usage up to 60%+ and a lot collison checks.

But then i made window size 50x50, set layout scale 0.05. And did exact same thing i had almost 2-3 times better performance. So is there built in collision check range, which == window size . But is there anyway to set same collision check range/grid manually without setting small window size or adding events, as it seems to work nicely? Could not find any post about this.

You're talking about collision cells. Here's the blog post Ashley did when he introduced this feature.

https://www.scirra.com/blog/ashley/6/co ... on-in-r155

However, I'm not sure if there is any reliable way to manipulate the collision cells.