SIMD-0266: EFFICIENT TOKEN PROGRAM

Summary from the TLDR Crypto newsletter

Solana's SIMD-0266 proposal introduces p-token, a complete reimplementation of the SPL Token program that reduces compute unit usage by up to 98% through zero heap allocations, zero-copy data access, and full backward compatibility, without any client code changes. The Token program currently consumes approximately 10% of block compute units, with p-token cutting this to a fraction and freeing nearly 12% of block space for other transactions to directly increase Solana's effective throughput. Performance improvements range from 98.4% reduction for Transfer/TransferChecked instructions consuming only 76-105 CU versus 4,645-6,200 CU currently. The upgrade has completed extensive testing, including existing SPL Token test fixtures, Firedancer fuzzing with millions of mainnet instruction replays, and three security audits from Neodyme and Zellic.