benchmarking question

[eluser]troll[/eluser]
hi,
im developing an app using codeigniter. im using de benchmarking tools for test. my question is about how much memory and time should use a mid-size 'standard' application ( CRUD , ajax, MVC)

in my tests i've got about 2mb and 0.5 seg. per page ¿is that fine ? ¿is that too much?
hope you can helpme
thanks!