OK I'll try and recreate the particle issue today. I'll host the videos on YouTube. I'll keep the same conditions for gameplay on (1920x1080 with V-SYNC on).
Here's a link to the missile glitch I described earlier. It's around four minutes and thirty seconds.
I'll set up an FPS count when I play next time. It was pretty good. I am playing with an Intel i5 (10th Generation) on an NVIDIA GeForce RTX-3060.