A thought on Game optimization (Draw calls, texture streaming)

Hello everyone, first of all I would like to thank you for your advises. Thanks to you, I’ve managed to reduce draw calls number from 700 to 300 and we’re heading for realistic graphics like Resident Evil 7 or Visage or Allison Road.
However, I’m still unfamiliar with how texture streaming works. My computer has 2 GB of VRAM and 16 GB of RAM. When I check stats in console, I see that 75% of memory is already used and it says around 400 - 500 texture streaming pool for now. Is that good or should I look for ways to optimize it even further?