@doedel, @serkandurusoy - the early versions of famous were written somewhat naively. Everything layout related (size, position, rotation, etc, and what needed to be rendered) were recalculated on every frame. This got improved a lot by 0.3.5 (by caching values and in many cases, only recalculating when needed) - but reached architectural limitations.
The new mixed mode release (0.5) is a major step up in this regard. A lot more attention was paid to ensuring calculations only run when necessary, and especially, garbage management. Less so in terms of memory consumption, more so in terms of the garbage collection interfering with performance (and consequently, battery life too). In short, the new version is a class apart.
Having said that, we’re still talking about a preview version < 1.0, that’s only just come out in beta – with no pre-built components/widgets yet. One can evaluate suitability for different types of projects on an individual basis with this in mind.
Is this famous related? Famous is “dead” (weird pivot of the startup) though I heard they’ve open sourced some of the technology to continue work on it.