Modulator with Liquid DSP and Lime Mini?

Dear All,
I want to implement a CPFSK Modulator at 9600 bps using Liquid DSP and Lime Mini.
I have realized the mentioned modulator in GNU RADIO but the delay was too much (10 sec) due to buffering and low speed.
Has anybody realized something like this with Liquid DSP and LIMESUITE API’s?
Thank you in advance.