Just to say that I had an issue of stuttering only after updating to the World Update 4. Oddly it was effecting airports like Nice, Schipol and Brussels but when I tried Leeds or Munich it did not happen. It happened with the A320 neo with mod but also the Default 747 which has not been moderated but not with a default light aircrqaft such as the Cessna. In other words it seemed to be airports within the latest updated area. I tried different graphic settings with no benefit. Hence my visit to the forum and when I disabled the multiplayer it resolved the problem. So Many thanks for helping me with this.