fs9 model AI framerates

[sonic]

I have heard several people say that fs9 models actually hurt framerates much more than fsx specific models. If this is true what is recommended for AI traffic, I have always used WOAI but I'm sure there models are fs9. Is it really a big diffrence and does any pay traffic use FSX models?

[Daube]

This is true, FS9 models impact the FPS much more than FSX models.
However, the models used by WOAI are so simple, so light, that they have a mcuh smaller impact then the default FSX planes used by the default AI traffic.
So removing the default FSX AI traffic and replacing it with the WOAI traffic usually leads to performance increase. (excepted if you install hundreds of AI packages, of course )