Is this normal?

I set the props, characters, pose, and the lighting etc. Then select Render which takes around 5 minutes to complete.
I can scroll around the finished render and save it to disc instantly, but when I try to go back to the Preview screen and start posing again, there's a 30-second delay before Poser lets me.

My scene is quite simple: 1 building with a set of props, 3 characters with clothing (quite often only 2 of them in the shot).
But honestly speaking, I get this delay regardless of scene complexity.

What is Poser doing during these 30 seconds? I just want to get back to the Preview screen and start posing for the next shot!

Any advice as to how I can prevent this would be great - even an explanation as to why it's happening would suffice :D
Many thanks,

Here are my render settings:

And here is my PC spec:

CPU: AMD Ryzen 7 2700 Eight-Core Processor
Base speed: 3.20 GHz
32MB RAM
GPU: NVIDIA GeForce RTX2070 Super

Thanks,
RSK