My sim already performed OK. i7700, 1060, 8 RAM win10, Orbx global+europe, many addons pay, Feelthere Airbus, Maddog, PMDG 737NGX and 777X. I had the bad idea to add FSDREAM JFK, KLAX and ZurichX to my Addons scenery. As soon I installed one of the scenery my sim was completely distroyed, tree on sky, aircraft skeleton, aircraft missing (only shadow), starways missing in some scenery, tree low quality etc.... I disinstalled immediately the scenery, but some problem still remains. For cross checking I purchased JFK from DD and no problem I found in spite that DD scenery is much more "Heavy" than yours. Addon Manager seems to work properly, +++redistributable installed, Firewall and Kaspersky inactive... Recently I tweak "Himem=1 and the situation improved a little. So I installed again Zurich but most part of time Building are missing specially usinh PMDG 777.
Suggestions?
Thanks
Mauro