What's the GC performance of Substrate VM's GC? Is it still the 1G young 3G old thing? What's the long term vision? In theory can this thing become "better" th

What's the GC performance of Substrate VM's GC? Is it still the 1G young 3G old thing? What's the long term vision? In theory can this thing become "better" than HotSpot, JIT and G1/Z/Shenandoah?