Because there is no such multithreading mode for the xtop process. This makes Creo Parametric much slower in opening IGES,STEP, ... files the other CAD Software.
The top, most voted for, "IDEA"
Creo does support multi-threaded processes on several processes https://www.ptc.com/en/support/article/CS115541
For those asking for a multi-threaded xtop, explain how it should be done.
Pro/Engineer, Wildfire and Creo are parametric 3D modeling tools that store the data in a hierarchical arrangement 'database' within the part or assembly files. This means that before feature 305 can be placed in the model, features 1-304 must be created sequentially so feature 305 knows where it goes and what it interacts with. It is this sequential process of building the model that limits multi-threading of xtop. There are some areas that can be 'divided' (NC tool paths, FEM, shading, etc) and these do utilize multi-threaded processes spawned off from the main xtop.
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