Today I have received an interesting performance benchmark comparing Inventor with other major mechanical CAD applications. It claims Inventor to be 2-4x faster than Catia, 2-4x (up to 20x) faster than UG NX, 3.6x faster than Solidworks and 1.5x faster than Pro/Engineer Wildfire. Inventor also consumes less memory – e.g. half of the memory resources needed for CATIA or Pro/E Wildfire for the same assembly.
The tests were performed on a set of parts and assemblies ranging from 100 parts up to 4879 part instances and on patterns with 4000 features. See the full performance benchmark report (PDF).
I would say that any 3D modeler is considered too slow and too RAM hungry by its users – especially on larger data sets. And even if it won’t help, it is good to know that other software is probably even slower.