Starknet announced that it has completed the Starknet v0.13.2 (Bolt) upgrade on the mainnet to support parallel execution and block packing, where parallel execution enables transactions within the Starknet sorter to be executed simultaneously by batching multiple L2 blocks into a special application recursive proof. With block packing, multiple Starknet blocks are processed per Starknet status update, allowing for batch processing of L1 fixed costs.