Use POWER8 and POWER9 ISA enhancements to improve the performance of GHASH. Demonstrate why achieved performance of AES-GCM is close to optimal for the platform. Optimized implementations in the Cryptogams repository may serve as useful references. Financial bounty upon completion and community acceptance of patches.
Please STOP adding such bug reports or feature requests. They are not helpful and such discussion are better done at the mailing list. In case you want to spend money to speed up things you may contact gnupg.com for a quote.