Is it possible to swap out the Phone.apk and contacts.apk of ICS ROMs?

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http://forum.xda-developers.com – I've been on Andromadus Mimicry for a few months now and my biggest gripe is the super slow Phone and Contacts app. Incoming calls take a long time to display full details, tapping on the phone icon can sometimes take up to 10s for the dialer to pop up. Is there a way to substitute a GB Phone.apk or something? (HowTos)