I think 8GB is just too low for XP11. If you can I suggest to get up to at least 16GB DDR4 ram. Invest in a good and fast SSD. The sim is very heavy on CPU. Slow HDD may slow the CPU down: HDD to CPU to GPU, back and forth...HDD is a mechanical thing it slows it down, does not help frames. Your CPU has to wait for HDD. In turn GPU is waiting for CPU and so on, this is very low level kind of process description. Here are my specs: i5820k processor overclocked to 4GHZ (stable), 32GB DDR4 RAM, Nvidia GTX970, X99S SLI Plus motherboard, Samsung 950 PRO M.2 x4 SSD (exclusively for XP11). Not the highest specs by any means but I still got 40 to 55 smooth frames with very high settings in XP11 this afternoon.