The memory arena is a typed array, which cannot contain object references and so does not need to be scanned by the GC.
If you keep JavaScript object allocations to a minimum, then GC pauses will be short and infrequent. This could actually be useful to write a game render loop or any other code that can't tolerate pauses.
If you keep JavaScript object allocations to a minimum, then GC pauses will be short and infrequent. This could actually be useful to write a game render loop or any other code that can't tolerate pauses.