I have this same issue. It used to work fine, I could swap weapons and nothing happened. Now it’s like a stutter, or a massive FPS drop for a couple of miliseconds after each swap.
Changing video configuration does not improve nor worsen this.
My spec:
- i5 2310 @ 2.90
- 8GB DDR3 RAM
- GTX 770 (with latest nvidia driver)
- Windows 10 (with every single update)