i've tried the new jar. it runs without crashing even for 60x20 scene. for 10x10 scene, it's overhead is not noticable. i tried it by setting flashSortThreshold to 15.
..which is at least as high as the object count but not quite as high as polygon count.
so in this case, sharing compiled data wont help, except for memory of course
It's better to batch as many objects as possible in one. If they need to be split again for rendering, the object compiler will do this anyway but in a way that's more optimal for the rendering pipeline.
mm, this requires some thought and trials i suppose. as i said, some tiles are highlighted, some others disappear or so. highligting can be handled by other means (an additional plane maybe, or via PolygonManager) but disappearing tiles should be different objects.
with a wild guess, how much gain would you expect from merging 20x20 scene into one ? when this tiles are close to each other or spread around the sccene ?