Each thread does have its own local TLAB in which bump allocations are performed; but you still have the GC effect even if you're using that. Provided you stay

Each thread does have its own local TLAB in which bump allocations are performed; but you still have the GC effect even if you're using that. Provided you stay entirely within Eden then your GC will just drop the space - but it is preferable here to not generate any garbage in these situations by eg pre-allocating the necessary objects and just doing field writes.