AndrewVK

It's hard to say without details.
The process of exporting an animated camera and objects from UE 4.xx to Houdini 18.5
always worked smoothly, then at some stage it broke (exactly camera orientation). It was fixed after the bug report. Maybe something went wrong again.
I did not check how things are in UE 5 and H19

javadsadeghi
Slicing going to simulate slices in parallel or one machine always going to wait for another machine to response?

Yes, all machines will wait the slowest one.

javadsadeghi
but my new problem is that its not faster simulating on a single machine

Slicing....usually it is not a question of time....it is more about RAM.
Try to simulate something huge ... when one machine can't do it.
You will see the difference (in time also)

This could be a firewall problem.
I had the same thing until I read this post:
https://www.sidefx.com/forum/topic/37431/ [www.sidefx.com]
As Jeff Lait said:
"The client-to-client communication also allocates a port at run time. There are no fixed set of ports to open between the machines. There needs to be no firewall/shorewall between the machines that are simulating, or between them and the tracker. There MUST, of course, be a firewall between your machines and the rest of the internet!"