A static image is faster than a dynamic (using module) image. Less modules is also faster, because it make less probing for device id (very little gain, but you save 100mb disk space too). If you don't need something, don't build it. If you are not sure if you will ever need it, use modules. For things that you are sure to use, make them built-in. By following those rules, your computer will boot faster, take less memory in both ram and disk.
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