TyFlow Cache / Birth Fluid Performance

[Bentera]

Maybe i got this wrong, but when i export my simulation as Tyflow Cache, of course it run`s smoothly without any calculation time. When i create a Birth Flow and a Flow Update Operator to bring the Simulation back into Tyflow (without any further operators), it seems like Tyflow calculates every frame as if i it has to recalculate all the events before the cache. Is this supposed to be right or should the Birth Flow - Update Flow combination run as smooth as the TyCache Animation?
If it really has to recalculate everything, what would be the advantaage of caching one tyflow and bring into a new one (for example caching out the big chunks and bring it back in for secondary debris) instead of doinf it all in one tyflow "window"?

Thanks in advance & Kind Regards
Ben