Marcio,
Changing resolution in the screen saver isn't currently an option, which is why the menu is dimmed.
To increase performance on your iBook you can:
1) check the "Economize video memory" button if your fps is REALLY slow (like less than 2)
2) set the "shimmer" to "Off".
3) decrease the number of fish you have
4) turn off the bubble column
5) change your monitor to "Thousands" of colors using the monitor control panel.
Please let me know if this helps you.
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