Thank you for posting in the community and unfortunately the GTX 1080 is not going to be a good GPU for Twinmotion 2023.1 as the engine was updated to 5.0 and the requirements/performance are different.
Have you tried to use DirectX 11 as that could be performing better for you since Path Tracer won't work. What are the results with the Demo lake house scene are the results much different or is it specific to one of your scenes?
If the problem seems scene specific and is still occurring please contact us directly to further investigate.