The largest cost is that you are allocating a fixed size stack, and that usually has to be big enough for whatever thread you might run. Virtual threads only ha

The largest cost is that you are allocating a fixed size stack, and that usually has to be big enough for whatever thread you might run. Virtual threads only have a stack as big as they require, and that’s likely to be fairly small. A lot of thought went into the foot print of virtual threads, we had long discussions about individual fields!