two questions : cpu time limit, scrollling

Hi,

I have two questions :

1)  I recently got an error message wile trying to compile a large
document , something lile "cpu time limit exceeded", together with
some number like 4320. I got this while running on battery.
Later, back on power adapter, the document compiled without a problem.
Would it be a good idea to set the cpu time limit to a different higher
value in the .emacs file and is that possible ?

2) While scrolling in emacs buffers one line up and down, I am using  
the up and down
arrow keys. Is there a way to scroll up and down will keeping the  
document
centered ?

Thanks,

PM
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