what type of app u r trying to port from 5800 original fw?
I'm trying to update more than porting.
The main goals are e-Mail app and Gallery.
The e-Mail app on 5800 is blazing fast compared to I8910 one, also the Nokia one knows the right settings of security and ports for POP3 and IMAP for Hotmail and Gmail.
On the MediaGallery2 side, any improvement is a huge step forward, as the default version on I8910 is stutter problem plagued.
Secondary goal is the music player, as I can't live without a customizable equalizer, also the v52 version has covers on the artist list as the one from C6 or N97.
If the porting of this Music Player can't be achieved, at least I'll try to find a fix to the kinetic scroolling stutter, and the "m4a" file problem encoded with AAC+ (strange behaviour at the start of playback of the song).
These are my goals, but if anyone suggests any other application to make the phone faster, I'll be happy to test whenever I have some time.
Thanks for your interest.