Which assembly method is better for increasing system performance whether Bottom up or Top down assembly?
In fact choosing between these two techniques depends on your design intent. However, there are some considerations regarding the top-down design:
Reference: 2013 SOLIDWORKS Help - Top-Down Design
Aside from that there are other techniques to speed up your assembly performance, no matter how large and complex it is, such as Large Design Review mode (LDR); Speed Pack, etc.
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