Premiere Pro Multicamera lags on my very powerful PC when moving the blue bar
Multicamera is working bad on my PC and i don't understand why, considering the specs.
It works smooth when i hit play (it starts after 3-4 seconds), but when i drag the blue bar into the timeline, the real lag comes out. Every time i move that bar around the timeline, it lags.
Here is an example of such lag:

Is such lag normal, considering that i'm using proxies?
The video files are on a NAS QNAP connected with 10Gb ethernet, and the proxy files are on a RAID 0 SSD installed on the machine. Of course, when i experience such lag, the proxies are active and online.
Here are my specs:
- Adobe CC 2015.3 apps
- Windows 10 Pro 64bit Version 1607, build 14393.447
- CPU: I7-6900K
- GPU GTX 1080 Gaming G1
- 128GB RAM
- 512GB M.2 SSD for OS.
