For SIMD types with elements other than Int8, in addition to the pshufb, there&#x27;s also the cost of computing the pshufb byte indices.<p>For additional context, the current version of SIMD.js is aimed at covering the basics that strike some balance of being fast on most hardware and being useful. It&#x27;s also just the beginning, and we expect it&#x27;ll evolve to add many more features, quite likely including pshufb-like functionality.