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I checked the jpeg compression of vectors using my vector (post #106442)

Original ai vector format: 379kb :o
32bit png: 916kb
24bit jpeg 90% (acceptable quality): 1459kb
24bit jpeg 100% (worst setting): 3808kb
24bit jpegged png (recompressed jpeg90%): 3283kb

ps: at a game cg (post #61237)
png original: 1845kb
jpeg 90: 450kb
jpeg 100: 2055kb
jpegged png: 1856kb

jpeg_artifacts is clearly visible on jpeg 90% images without enlarged view.
don't use this quality. at least, use 95% without down sampling.
in game_cg, file size of 3×jpeg95 ≒ lossless png

caution: even if there are no visible jpeg_artifacts, jpegging always decrease color depth (desaturate vivid red, blocking darks, e.t.c.).
this color shift is a serious matter in processing of scans.