Consider using Zstandard and/or LZ4 instead of Deflate
One of the issues we have with .PNG is slow read/write times. There are now new lossless open source codecs without patent concerns, such as Zstandard (maintained by Facebook) or LZ4: https://facebook.github.io/zstd/ https://github.com/lz4/lz4 Zstandard is used by the new Khronos KTX2 GPU texture format specification. I propose that it be added as an option to a future version of .PNG. The possible speedups are quite significant, and for users that read and write a lot of .PNG's as part of th