komugi--
I have a 505, not a 700, but if I try embedding a font in an LRF formatted book, I do notice quite a delay when turning pages. (I imagine this wouldn't be quite as bad with a 700 due to the faster processor.)
But, if I embed a font in an ePub file, I do NOT notice any increase in the amount of time the device takes to display a new page. This is one of the reasons I've started using ePub as my preferred format over LRF.
dordale