Background image size

Hey guys,
I wanted to ask you what will make the game run more smoothly. For the background in my game I made big detailed images in photoshop, is it better to put 3 very large photos, or is it better to slice them into smaller images? The sliced images look identical to those full one its just a little more work, but which works better?
Thanks for your help!

I believe smaller images are better performant than a large one. Yeah, it’s pain in the rear to chop them up and place them, but the players will appreciate it.

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If you’re concerned at all about mobile devices, especially an html game, split them up. Depending on the RAM of the device it will only render an image up to 3 or 5 megapixels.