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⇱ Simdjson Shows More Speed-Ups Possible For SIMD In JSON Parsing: Another 30% Boost - Phoronix


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Simdjson Shows More Speed-Ups Possible For SIMD In JSON Parsing: Another 30% Boost

Written by Michael Larabel in Programming on 19 February 2026 at 06:05 AM EST. 6 Comments
Simdjson is the open-source project for high performance JSON parsing by leveraging SIMD instructions for "parsing gigabytes of JSON per second." Notably it showed years ago the huge performance advantage to using AVX-512 in JSON parsing for surprisingly big benefits. Simdjson has continued advancing since then with various optimizations over the years and today is out with simdjson 4.3 that brings yet more SIMD optimizations.

Simdjson 4.3 released today and now handles runtime dispaching on LoongArch around the LSX and LASX instructions, Microsoft's Visual C++ Group improving the build throughput by 30% through build optimizations, and various other enhancements.

Catching my eye with the new simdjson 4.3 release is this pull for SIMD string escaping and batch integer formatting optimizations. For string-heavy JSON parsing it can yield some massive benefits.

👁 simdjson 4.3 benchmark


This pull that is part of simdjson 4.3 yields a 30% improvement for the Twitter benchmark and a 6% improvement for the CITM Catalog benchmark that is more numeric heavy than string heavy. This SIMD tuning around string escaping and batch integer formatting is using ARM64 NEON and SSE2.

Downloads and more details on simdjson 4.3 via GitHub. For those interested I do have simdjson benchmarks on different CPUs.

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.