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Changes between Initial Version and Version 1 of Ticket #56263, comment 5

initial	v1
9	9	the problem lies in compressing already compressed images (introducing generation loss) but I think it is undeniable that webp and avif and jxl are much better than png and jpeg.
10	10
11		Starting from a 50% compressed jpg image (as i have seen myself doing) you can't expect to have good results because what you are compressing is the version already heavily pixilated from the jpg compression to which you are going to add other artifacts, one thing that is important is that the original should not be "pre-optimized" (o~~r even better lossless~~). This problem is partly corrected by the fact that webp larger than jpg are removed (https://github.com/WordPress/performance/pull/418)
	11	Starting from a 50% compressed jpg image (as i have seen myself doing) you can't expect to have good results because what you are compressing is the version already heavily pixilated from the jpg compression to which you are going to add other artifacts, one thing that is important is that the original should not be "pre-optimized" (on the contrary a lossless would be better). This problem is partly corrected by the fact that webp larger than jpg are removed (https://github.com/WordPress/performance/pull/418)