Dartium doesn't attempt to do cross-VM GS, so that supposed overhead isn't there. I'm not sure any such overhead would always occur, or would only happen if bo

Dartium doesn't attempt to do cross-VM GS, so that supposed overhead isn't there. I'm not sure any such overhead would always occur, or would only happen if both VMs were in use and there were cross-heap references. It'd doesn't seem likely that cross-heap GC would have such an impact with only one heap.