For applications like Vue there is a simple rule - the more memory the better. I would think of minimum 1GB, otherwise the chance that Vue will need a lot of virtual memory is very high - and the speed very low. What i do in complex scenes is to hide parts i am not working on via invisible layers and activate them only when i need them. AND, i use Wireframe boxes for especially high detailed objects like plants or Poser characters as long as i don't really need to see them completely. That speed up the response a lot too. Needs maybe just a little more brain work in terms of imagination but is efficient. Sometimes almost all objects used i display only as wireframe boxes.

One day your ship comes in - but you're at the airport.