1- Nominal speed on DOSBox depend of your computer speed. If you have a multi-threaded core then DOSBox only use one of your cores. The best you can do to increase the speed is to play with the cycles a little and maybe with the other graphical options too.
2- That is most probably because either your screen can't take that resolution or because you simply need to adjust that particular resolution in your screen options. For a reason beyond myself, some screen have separate option setting for each resolution and sometimes the default setting is way off. If this is the case then moving the screen back in shape should not interfere with other kind of resolution.
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