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continous sidescrolling game jerking


Vivek Agrawal
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Hello,

 

So I have been working on a continous side scroller game with parallex background and ledges for the player to jump on.

i have made backgrounds as tilesprite and put autoscroll on it.

 

the game is jerking a bit from time to time, small lags in some intervals.

 

can anyone suggest what might be the possible problem?

 

here is the link to my game: http://gamegurus.com/demos/RunningMan

 

Thanks

 

Vivek

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Do you limit the max fps of your game ? At 30 for exemple ?

 

And try to put the automatic scrolling of your bg on the render function ?

hi

 

no to both actually, havnt limited the max fps of the game, will try that out

 

and bg is getting scrolled using autoScroll function of tileSprite

and other things like coins are getting scrolled by velocity

 

can you please explain what did you mean by scrolling in render function?

 

Thanks

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I did a real quick CPU profile of your game and the garbage collector took ~2.9% of your program's execution. That seems kinda high to me and would explain the jerkiness. It might be time to profile your game yourself and see if you're allocating a lot of objects every frame or something similar.

 

Things to look for: making new objects (literals, arrays), using lots of anonymous functions, etc.

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hi

 

no to both actually, havnt limited the max fps of the game, will try that out

 

and bg is getting scrolled using autoScroll function of tileSprite

and other things like coins are getting scrolled by velocity

 

can you please explain what did you mean by scrolling in render function?

 

Thanks

 

I think you can try to put all the scrolling functions like velocity and tilesprite scrolling in the render function of phaser and not in update.

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I did a real quick CPU profile of your game and the garbage collector took ~2.9% of your program's execution. That seems kinda high to me and would explain the jerkiness. It might be time to profile your game yourself and see if you're allocating a lot of objects every frame or something similar.

 

Things to look for: making new objects (literals, arrays), using lots of anonymous functions, etc.

 

i am using object pooling for most of the major objects, any way to check what things are getting collected by garbage collector?

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Not that I know of, no. I've always done this kind of thing by hand. The heap allocations profile isn't as helpful as I'd want it to be, but that might be a good place to start.

 

Google's got a good list of things to look out for: https://developers.google.com/speed/articles/optimizing-javascript?csw=1

 

This too: https://developer.chrome.com/devtools/docs/javascript-memory-profiling

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