File Integrity Check

I use tripwire for a long time on my FreeBSD servers

one thing that's bugging me is that it takes like 20 minutes to check the system with the default config:

so I'd like to know:
1) is there currently some other tool that does tripwire job better?

2) anyone has a list of "probably changed files when a server is hacked", or something like that?

I mean, I'll be happy if tests can take 2 minutes instead of 20 and I detect intrusion 99% of the times instead of 99,9%

so "key files/dirs" would probably be enough instead of checking a lot of dirs with recursion