because there was no traffic..
if you have autogen complexity set to dense or higher, then having traffic on will make FSX render the jetways in all airports within a certain radial distance from your plane, bringing the system down to its knees. that's why traffic hurts. you'll notice that if you add traffic such as WoAI, found
here, the FPS hit won't be nearly as much as the default FSX traffic, because these models don't make FSX use its jetways, allowing for those saved up resources to be used for something more useful
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