why my v4 lagging while flying

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Just now, I re-install windows 10 , and reinstall p3d v4. load everything by default and everything runs smooth. 

on farming area, I get something like over 130~150fps.  When I set to 60fps, it flew perfectly smooth even in urban areas.  

But, when I start to add 3rd party sceneries, which I have them on scenery library of 5 or 8 I think...the sim runs very lagging.  (I think I even dare to think about installing REX:huh: )

I don't know if this is due to software problem or my system, but if I delete 3rd party scenery, and goes back to normal.

For now, I think I'll only use v4 as 3rd party aircraft add ONLY, because payware aircraft doesn't seems to have this problem. 

My system is core i5 4th gen, 16GB RAM, GTX 960 4GB.  

If you start to see your sim  runs slow, reduce your addons and it will probably go back to normal where it was.  :mellow:

for those who have core i7, may have better performance, thus, you can probably add more few scenries from above my spec, and it might work flawlessly. 


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