What are the best options to use for maximum Mkeys/s output?

I assume that -u (search uncompressed addresses) is quicker than -b (search compressed and uncompressed addresses).

For -i (the input file) - I'm unclear about what's in that file. Is it just a list of prefixes you want e.g:
1abc
1def
1ghi
...

Or something else? I see people using input files with hundreds of lines but they don't post the content of those input files.

Can someone give an example, please?