I investigated using JPEG XL for high speed applications but encoding time was much slower than JPEG with libturbojpeg even if you reduce encoder complexity to a minimum
it's much much faster than the other alternatives tho. and staying with JPEG isn't really ideal with it's low quality and limited options going forward.
Not for a long time. The WebP encoder has improved a lot since MozJPEG was released. But these days we have Jpegli [1] which beats WebP at higher quality levels.
I have a similar experience where jpeg encoding and webp encoding result in far less computing resources use that jpeg XL or AV1, and was curious at what other people used (as I might be using the wrong library).
MozJPEG encoding times are not that great but decoding is still fast.
I believe with Jpegli you can have faster encoding than with MozJPEG.