is ther a maximum number of layouts i can use?

also does the more layouts drop the performance ? is it better for the performance to build a game in several layouts with every one of them will be small, or is it better to build huge layouts but less in number

This is from the manual .

Number of layouts also is unlikely to have any effect other than the download size. The layout size also does not have any direct effect; larger layouts do not use more memory or require more processing, unless you use more objects.

https://www.scirra.com/manual/134/performance-tips