I wrote a small test bench for my own uses as wanted to compare with different codecs and see how "raw compression" would work, how would QOI+ZSTD combination work and so on.

Here's example output..

  image: 1502 x 1800 ( 10560 KB )
  ----------------------------------------------
           encode(ms)  decode(ms)   size(KB)    
  ----------------------------------------------
  qoi:          31.2        21.6       2452  
  qoi+zstd:     46.7        19.3       1832  
  zstd:         47.4         8.7       2742  
  lz4:          14.1         3.0       4108  
  png:          92.4        18.0       2795  
  zpng:         24.1        13.3       1394  
  jpg:           2.7         1.8        517  <-- lossy
  webp:        199.6        19.1        227  <-- lossy