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https://github.com/veluca93/fpnge is a very fast png encoder. A bit lower compression ratio, but runs significantly faster than alternatives. Here is a presentation with benchmarks:

https://www.lucaversari.it/FJXL_and_FPNGE.pdf

This looks right up my alley, thanks! Will give it a shot.

This worked out for me. What I was actually interested in was reducing CPU utilization, which generally speed is a fine substitute for (the same work being done in a smaller time slice means lower overall utilization). It reduced utilization enough that I'll likely push to use it for production in the future (not immediately, there's bigger low hanging fruit).

stb_image is a single header image encoder/decoder that is used pretty widely across game development codebases. and it supports a ton of different formats.

https://github.com/nothings/stb

The main page implies it only does decoding, am I reading it wrong?

Edit: stb_image_write exists, I was reading it wrong

libsnpng is pure C.

And it doesn't look like the png crate provides a C API but if your usage is not overly complex it might be easy enough to byo?