Is there a way to set a part's cframe without breaking the welds?

I have a viewmodel and I'm trying to "weld" it to the camera, (by simply having a part that sets its cframe to the camera cframe every frame) but the welds break when I try to move the camera part.

I have tried using SetPrimaryPartCFrame on a viewmodel model, but I was wondering if there was a less CPU-intensive way to do this. Imo setting 30+ parts cframes every frame is pretty laggy.