Small, niggling irritation - irregular letter-spacing on screen

Question

I've now taken the time to check and compare, thanks to mif, and am certain that the two FrameMakers resident on my PC behave just that little bit differently:
in 8.0p277, with Adobe PostScript* as the default printer, letter-spacing is fine
in 9.0p237, again with Adobe PostScript* as the default printer, letter-spacing is just that bit off here and there
I vaguely remember talk of something like "printer metrics", but from long enough ago for me to remember nothing useful. If someone can tell me what to tweak to get 9.0 displaying documents as comfortably as 8.0 did, I'll be grateful! Thanks in advance.
N
* AdobePS Adobe PDF on LPT1:

Answer 1

I prefer the On setting, myself. If I understand it correctly, setting
DisplayUsingPrinterMetrics=Off makes the type look clearer at lower zoom
levels by making the characters best fit the actual pixels on your screen.
The downside is that the line lengths are no longer correct. I've actually
seen it make type extend beyond the text frame. It prints okay, but looks
very freaky on screen. I seem to recall that it sometimes gave me fits
trying to line up text and graphics, too, because the type does not fall
where it will print.
Setting DisplayUsingPrinterMetrics=On makes the line lengths on screen
accurate. It does this by fudging the intercharacter distances a bit. This
is only visible at low zoom settings. If you zoom to, say, 200%,
intercharacter distances are accurate, too, because there are enough pixels
to divide things up nicely.
So, the setting lets you choose between the clearest characters, or the
clearest layout.
Mike Wickham