It's impossible to debug these issues if you don't post a scene file.
Here are some tips anyways:
1) Confirm that vert/face counts are really not changing from frame to frame. To do this toss an edit mesh modifier on your cache and type $.numverts and $.numfaces in the maxscript listener and various frames to confirm the topology is static over time.
2) There must be something wrong with your setup or some other issue you aren't noticing because making camera changes has zero impact on the data a tyFlow outputs to VRay.
3) You've probably got some render-only settings on an input object, causing the flow to reset at rendertime because your object(s) change.
4) Keep experimenting and watch the maxscript listener for tyFlow debugging output. tyFlow prints out relevant info regarding simulations. Please see the docs on the Debugging rollout for more info you can print to the listener, to further debug why things are taking so long.
Here are some tips anyways:
1) Confirm that vert/face counts are really not changing from frame to frame. To do this toss an edit mesh modifier on your cache and type $.numverts and $.numfaces in the maxscript listener and various frames to confirm the topology is static over time.
2) There must be something wrong with your setup or some other issue you aren't noticing because making camera changes has zero impact on the data a tyFlow outputs to VRay.
3) You've probably got some render-only settings on an input object, causing the flow to reset at rendertime because your object(s) change.
4) Keep experimenting and watch the maxscript listener for tyFlow debugging output. tyFlow prints out relevant info regarding simulations. Please see the docs on the Debugging rollout for more info you can print to the listener, to further debug why things are taking so long.