Question about scaling layout

Hi all,

I'm wondering if scaling the layout "at the start of the layout" has any impact on performances? I suppose not but I prefer to check.

Basically I have rescaled the level I made to see if that would play better before I make more levels:

http://konnee.free.fr/Color_Scale

But it seems to stutter a bit more when it's scaled down, specially compared to the original version:

http://konnee.free.fr/Color

So I'm wondering if it would be better to resize all the assets manually or not? The other thing I notice is the blur appearing in the background is a bit worse when moving, but that's probably logic since t's scaled down.

Thanks,