Comment by janwas
24 days ago
Something is fishy here.
The JPEG XL report [1] measured between 240-270 Megapixels/s on 6 cores using the C++ implementation (disclosure: I was responsible for its SIMD/threading), about twice as fast as the then-current libaom.
Measuring on a single core is deeply misleading because our code was designed to scale well. I believe AVIF requires tiling in order to parallelize, which causes artifacts at tile boundaries.
It’s a measurement error: the `hyperfine` command uses `jxl_cli --speedtest` which, by default, does a warmup run that ends up in hyperfine’s measured time.
jxl-rs is single threaded. It may be not a good idea to use many threads per image as one page can have many images.
jxl-rs is not single threaded.
jxl-rs as it is used in Chrome is single-threaded.