Hi guysJust a quick question regarding something I've been wondering about the past few days. PMDG have few (if any) peers when it comes to quality MSFS aircraft products with a depth and level of reality that you'd expect from a multi-million dollar full motion simulator that would sit at the Qantas Jet Base in Sydney. You guys go to great lengths to simulate virtually (no pun intended) every single system that exists on the real aircraft. So my query/concern is this. With each new system comes coding to simulate it and with each new line of code comes the possibility of impact on framerates. So without going into specifics, can I ask if PMDG is ONLY simulating systems/processes that can actually be seen/heard/manipulated in the sim and not something that we cannot see or do in FSX? My reason for asking is if something is simulated that we can have no impact on or that has no impact on how we fly the aircraft in FSX, it may only slow down the sim and could be considered unnecessary. Sorry for this rambling post, but I hope you understand what I'm getting at and can provide an answer to my query.

I think you exaggerate impact of "system" simulation on frame rates. Majority of such background systems do not need to be updated 24 times a second, their combined impact on performance may be negligible regardless how many "systems" you may have. What makes real impact on performance is everything that directly relates to the graphics.

What Michael said.Additionally, (and sorry for responding, not affiliated with PMDG), it isn't a black/white thing to know which things could have effect on what happens in the flight deck and what things not. There are many environmental factors to consider, for example, that will have an effect on how a particular system is functioning, even though it would at first seem "not linked to flying" in any way.I would guess that most of the more detailed stuff and simulation lies not in the systematic connection of technical elements per se, but rather in the subtle effect on what environmental / circumstantial things will do to this systematic connection of elements. For example, the operation of pneumatics in certain environmental conditions. The operation of any critical system, when there is a failure on some other but parallel system. And so on.Mosf of the great sims in FS today will have the basic system coding either really well done, or well done. Only a handful will have the other stuff I am talking about baked in there. Real flying is at least 50% of the "other stuff". When you have a sim that can take into account the elements that surround us, and port those to the aircraft behaviour, be it a system or flight dynamics "feature", then we are talking about a Simulator. Others without that kind of depth are in my opinion mere basic system trainers.Tero