There are lots of tools available to do this on a per process basis without the node software itself supporting it. But I’d argue that lowering the concurrency is probably the better way to do this. Since the pieces are very small, setting the concurrency to a low value effectively limits bandwidth but will have a much smaller impact on node reputation as when transfers do happen, they are still speedy. I’d start there and if it still goes over acceptable limits use a bandwidth shaping solution like @Pentium100 already mentioned.
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