MCX is Arno's ModelConverterX found
here. It's very good at tweaking and exporting models or even whole libraries. With the default trees, you could import the whole library, add an empty LOD (models vanish at a given distance), and export to a new library. If you only need a few tree models, you could just adjust the ones you need then export them to a new library.
SP2 broke LODs, so the processor is trying to draw every model regardless of the distance and whether you can actually see them from that far away. By using MCX to fix the models, you can make the trees a lot easier on the processor. They'll vanish like autogen does from a distance. MCX can also turn off the shadows for the model.
I've been using it to tweak models made with Instant Object Studio. IOS doesn't do LODs, so I use MCX to add and empty LOD. I've also been using MCX to add volume shading to the model. That makes the model able to cast shadows on itself.
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