http://revuo-xmr.i2p/periodicals/periodical-3-2019.html
First, the dynamic block size algorithm was adjusted to better accommodate short-term spending sprees while keeping long-term growth sensible. Second, a PoW tweak (CryptoNight-R) curbed the ASICs previously present on the network. Third, an encrypted payment ID was added to each transaction to improve transaction homogeneity.