Hyperliquid founder Jeff announced on Discord that the Priority Fees mechanism is now live on the mainnet in Alpha mode. According to Odaily, this includes Gossip Priority Fees for prioritizing data reading and Order Priority Fees for prioritizing order writing. More details can be found in the official documentation.
Additionally, based on user feedback, the cap for Order Priority Fees has been reduced from 20 basis points to 8 basis points. Currently, Order Priority Fees apply only to IOC orders on HIP-3 assets.