Basically no. In theory designers are supposed to build several models of their aircraft in reducing levels of complexity (LOD). As the aircraft gets further away from your viewpoint to lower LOD's kick in and reduce system load. Opening up the GMax sample models of the PA28, Dash8 and MD83 shows that several LOD models have been created - the lowest being quite rough. If a designer hasn't created several LOD models (I didn't on the Tiger) then you see it in all its detailed glory as soon as it gets within viewing range - even if it is just a dot on your screen. That's why Project AI came into existence in creating low LOD AI aircraft that didn't thump the frame rates too much. I guess the trick is to look at an aircraft's MDL file and if it looks big don't use it for AI. bones -----Original Message----- From: jhb-bounce@xxxxxxxxxxxxx [mailto:jhb-bounce@xxxxxxxxxxxxx] On Behalf Of Gerry Winskill Sent: 23 January 2008 17:00 To: jhb@xxxxxxxxxxxxx Subject: [jhb] AI Impact Whilst checking out a reasonably complicated scenery I took a look at the factors within my control that might impact on framerates. One had a far greater effect than the others, the Airline Traffic Density slider in FSX. It won't be helped by the fact that some of my AI aircraft are flyable, with a decent appearance. Like the Flybe Dash 8 Q400, the Monarch B757 etc. Is there anything I can do to these models to reduce their effect on framerates, when used as AI? Gerry Winskill