Network variable callback functions

[proton029]

I have 2 network variables that are  used as subscribers with each one having separate callbacks. The problem is when i'm getting data to these variables simultaneously ,the data analysis UIR displays data very slowly . Is there a way i can put these callbacks in separate threads. I seen the postdefferedcalltothread function but i couldn't find out how to use it for a network variable callback function. 

All advices are welcome