anonymous user
If you close all 3D windows is your model still slow? Because that is weird and should not happen. If you mean that moving through the model is slow then there are a few things you can do:
1. Close all 3D windows. That way your model should be fast again.
2. Switch off layers. Layers that are switched off don't have to be drawn and help a lot in speeding up
Outside FlexSim you can also do a few things:
1. Decrease the size of the 3D cad drawing by removing everything that is not visible on the outside. For instance if you have forklift, underneath the exterior there is a motor and axels etc. These can all be removed without interering with the way it looks.
2. Often on good drawing you have layers with information about welds of holes etc. These layers can be removed.
3. You can use software like Polytrans to reduce your polygon count.