Take a look at VIPS. It's the fastest one I've found so far, and is free for commercial use.
https://github.com/libvips/libvips/wiki/Speed-and-memory-use
On that benchmark, it's 2x faster than Pillow-SIMD, 5x faster than imagemagick, 6x faster than opencv, 8x faster than freeimage, etc. It has dramatically lower memory use too: more than 10x less than imagemagick, for example.
