The Bloom filter is a field that is part of the RSK block header. It occupies 256 bytes, which represents about 30% of the block header size. Light clients, blockchain bridges and the PowHSMs do not require this information for every block.
This RSKIP proposes a way to remove this data from the header for nodes or automated systems that do not require it, thus reducing costs (Internet bandwidth for light clients, gas consumption for bridges, transfer-time for PowHSM).
You can read the full proposal here.
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