On the 27th July, MS will launch Update 5 for FS. They have reworked the engine and managed to increase frame rates by 40-50%. Pretty fascinating stuff. I wouldn't be surprised if loading speeds have been reduced.
Overall it seems like the PC and Xbox versions will be identical both visually and under the bonnet.
One fine print is VRR. FS will be one of the first non FPS games for which VRR matters. For TVs without VRR, frame rate is fixed at 30fps. With VRR it can go up to 35-40fps over densely populated urban areas, but as high as 60fps over rural areas.
Now I'm 100% guaranteed to buy TV with VRR.
Microsoft's Flight Simulator team completely revamps the game's engine to significantly reduce CPU usage and boost frame rates.
www.tweaktown.com