Have you installed GSX ? It's mandatory for all our sceneries using SODE and, if you don't install it, lots of objects required by KSDF will not be installed, like docking systems, marshallers, jetways, etc., which will cause pauses when the sim is looking for them.
Also, while dornier posted a P3D4 screenshot, implying he's using P3D4, folhetas didn't said which sim he uses. Under FSX, you MUST turn off some features (which ARE disabled, in FSX, by default), using the YouControl menu, since those are simply too much for FSX to handle, especially the 3d cars parked on the terminal roofs, but you might also try turning off the custom ground traffic in FSX.
In any case, here's a video of a landing I just made at KSDF (this is P3D4), showing how it's very smooth: