GrabCAD part slowing down my assembly in SOLIDWORKS

i suggest to try assemblyxpert.

SOLIDWORKS just crashing is most commonly caused by running out of memory, or swap space on the hard drive.
Troubleshooting it can be difficult, but I'd start by trying to do a very simple motion study of two blocks or something equally non-challenging.
Also consider making those "simplified" configurations of parts and assemblies I mentioned above. The parts should have all "extra" cosmetic features removed. Fillets, text, graphics, helical threads... Make the parts as simple as possible.

You didn't even press the like button for the model yet... That has to be a requirement before getting help on downloaded models :)

It is a great model, but there are a ton of complex features and sketches which will slow down a system.
- You could/should scroll through the models and suppress any details you don't need.
- You could also save the assmebly off as a "dumb solid" if no edits are needed.
- Loading the model(s) as lightweight can be handy, but I don't use that option much.
- Tools-Defeature can help to remove some complexity, but I usually just make a new part/assembly configuration with features suppressed.
- Also, go under tools-options-document properties-image quality and move the slider a bit to the left for the shaded mode rendering.
- Your graphics card is most likely not on the "supported list". It has been a long time since I used a geforce card, but I found they could handle one, or several parts at once, but there was a threshold which made things crawl if it was exceeded.

Don't forget to go back and press the like button. It took hours to make that model, it would be seconds to show appreciation for it.