Don't know where I read this, but it said: better use high resolution with JPEG compression than low resolution without. For the same file size, that is.
My experience: 300dpi is largely sufficient even for schematics, with compression. If the original is bad, has exceptionally small lettering or such, I take 600dpi as a precautionary measure.
Of course JPEG does the artefacts around sharp contrasts, but as long as its perfectly readable I prefer that to humongous files that take minutes to open...
cheers
Martin
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Using JPEG for those will result in nasty artifacting around the text, border box, etc. I'd not recommend that at all.