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Image Optimization Performance

1 post · Oct 2015

What this trail covers

Cloudflare's image optimization capabilities have evolved to include significant performance improvements for jpegtran, a key tool in its Polish product. This involved profiling and applying SIMD instructions to accelerate Huffman coding and zero-value skipping, resulting in a 2.25x speedup for jpeg image processing. This optimization directly contributes to faster website performance for customers by reducing image sizes more efficiently.

All Cloudflare trails
  1. Doubling the speed of jpegtran with SIMDThis post details the optimization of the jpegtran image compression tool by leveraging SIMD instructions (SSE2) to accelerate two critical functions: `encode_mcu_AC_refine` and `encode_mcu_AC_first`. The optimizations included vectorized absolute value and right shift operations, efficient EOB index calculation using `_mm_movemask_epi8`, and optimized skipping of zero-valued coefficients. These changes resulted in a 2.25x speedup for the tested image.