Dune2 stutters in Cubase

[Henko]

At first i am thinking; CPU usage but its fine. I have no problem when i have 2 or 3 VST's running simultaniuos but when together with 10 or more, it cracks and stuttters as soon as i play one note. All the sounds of Dune2 give these results. (Settings on Low CPU)
All the other VST's i use are working fine. Even A fully loaded Kontaktplayer, Omnisphere2 and Nexus2, UHE plugs are performing remarkably fine. One would expect that these last mentioned plugs are more critic when it comes to cpu/Ram usage but these are average in consumption.
Even latency is fine, with my Lexicon IO42.
Why o why is Dune2 the only VST thats giving me problems?

Running with Cubase 8 Elements.
other plugs i use are:
Alchemy (camel Audio)
Synthmaster 2.8
UHE Hive
UHE Bazille
Omnisphere 2
Nexus2
Steinberg Triebwerk
Steinberg Dark Planet
Arturia Synclavier
Linplug Spectral
NI FM8
NI Absynth
Tone2 Icarus
Cakewalk's Z3TA+2
OP-X PRO-II (Sonicprojects)
Xfer Serum
Mpowersynth 9.10
Air Hybrid 3
Diversion (Dimitri Sches)
Tantra (on insert)
Tracktion Biotek

My system is a Windows 10 (Enterprise) operated ASUS N76VM i7 laptop with 8 Gb RAM and 500gb Samsung SSD

[Kriminal]

What 10 are you using when this happens?

[Teksonik]

Try turning off Multithreading in DUNE 2.

[Arksun]

Try turning off Multithreading in DUNE 2.

This. Cubase doesn't really like it when plugins try to handle the multi-threading themselves. You can sometimes get away with it if just one of the instances of the synth has multithreading enabled and the others don't. But ultimately you'll be able to get more plugins as a whole running before the ASIO chokes if you just leave the thread to Cubase, ie one thread per channel.