Your dealing with - 1) Pretty old hardware at this point - other than the Passport all BB10 devices are using a chepset released in 2012..... it's going to be slower than today's hardware. 2) Your dealing with an emulator ruining on top of BB10.... that's always going to cause delays.
For Facebook... there are a number of different solutions with varying degrees of success >>
https://forums.crackberry.com/showth...1#post12698251