Question about Game performance

Hello, I am hoping a developer see this post because I have a question about the game's performance. Some time ago I asked if there was going to be that 2gb limitation and was answered no, Sins II was going to be a massive improvement but I was recently watching a youtube video.

And at one point, the game started to stutter  when there was a massive fleet in a gravity well fighting. https://youtu.be/kZK2hOtn6ag?t=1034

My question is, is this stutter a result of game limitations or is it pc hardware limitations?

Thanks in advance.