Improve feed load time

[sirpy]

currently when feeds first loads we format the feed item reading user/recipient data (avatar/name) from gundb which probably slows it down we need to cache stuff locally, either what we read from the db or the result of the formated event since user can change his avatar, the cache needs to be updated

[sirpy]

@serdiukov-o-nordwhale i've made some more improvements in my PR so for now i'm moving this to icebox.. it might not be required