Hi guys, after some extensive testing to rid mysely of these crazy stutters I was getting, and not the normal FSX stutter. These were almost like screen freezes for a split second every half second almost like the second hand ticking on a clock. Not thinking rdar contact had anything to do with it, it was the last thing I tried. After a fresh windows install and virgin FSX install with only RC4X installed I tested. No RC4 connected to FSX no stutters. With RC4 connected to FSX unflyable stutters. I am assuming it's fsuipc related and have seen on other forums about FSUIPC logging cauasing stutters but as far as I can tell logging is not the proble here, could be very wrong though. So putting my problems with RC4 calling my ultimate traffic 2 aircraft by pheonetic callsigns, Juliet, Lima,Uniform on the back burner I found I have a more serious issue. I never experienced issues in FS9 with RC4 wich is why I purchased for FSX because it's a fantastic and realistic addon when it works! So if anyone could assist me firstly with the unflyable stutters caused by RC4 and secondly with ATC not calling airlines by there callsigns I would appreciate it. Oh this is @ Ronzie, I have not tried the traffic view suggestion yets I will once I get RC4 flyable in my sim first. Thank you very much for your support!System specs just in case someone asks!Gigabyte GA-Z68AP-D3 MbSandy Bridge 2600K stable @ 4.5Ghz H100 liquid cooledWindows 7 Pro 64 bitAsus GTX 560 ti superclocked editionTwo OCZ solid state drives, one for OS one strictly for FSX16Gb Kingston HyperX 1600 RAM

We already covered in your other issue about having FSUIPC current from:http://forum.simflight.com/topic/66139-updated-modules/ and of you reinstalled RC you probably will need to do that update and makerwys as well.RC uses FSUIPC for FS data exchanges mostly weather, ai activity, and your location very frequently. The other resource RC uses is directly playing audio through your audio wav mixer via Direct X I believe.For audio leave the (random) pre-recorded chatter off. It reduces RC's disk activity as well since audio files are read and combined into complete commands before playing. I highly recommend a separate audio card and not use motherboard audio which shares ram and can use the motherboard CPU for audio rendering.Put all of the loading on even with your heavy rig and it might be tying things up somewhere. Try just RC and FSX with a default aircraft for starters.You can also try the affinity setting to put RC on a different core of the CPU.It is known that FSX is not multi-threaded and does most of its graphhics rendering on the CPU. If you are running a high resource weather add-on like ASE versions for FSX they also can tax the CPU. FSUIPC4 uses the SimConnect pipeline to get to FSX and SimConnect can get overloaded. FSUIPC itself uses little CPU resources.