Before 790, it's mostly blocks with consolidation txs that slow it down to > 1ms per utxo at times. After 790 it's almost every block, but this is the worst performing one I have: https://mempool.space/block/00000000000000000001ee48d567e68a768cc36cb7b47bd6ae1dc10c931c13d5 at 30ms per utxo, 10900 utxo in the block, all p2sh