Re-entry heating effects/mach effects causing massive stutter

[KristopherKerblumbus]

System specs:

Win 7 ultimate

Athlon II X2 270 3.2 GHz dual-core PC

AMD R7 240 2GB GPU

8GB RAM

I have a modded install but I've uninstalled all mods and get the exact same problem, so it's a deal with the base game. When flying SSTOs as their ascent profile requires significant time in the upper atmosphere, you often get the "re-entry" effects when throttling up. When this happens, I get a massive stutter. Not just a framerate drop, but a period of 1 second of 60fps and then 1 second of lockup. Repeat ad infinitum until one is out of the atmosphere or until frustration. Not running -force-openGL, but I could if that would help.

[KristopherKerblumbus]

Anybody have any ideas?

[sal_vager]

Please provide your logs Kristopher, the stickies show where to find them, we may need your dxdiag as well, your settings.cfg and the craft file you are using

[KristopherKerblumbus]

I'll give all that--but I thought logs only did good when there were crashes...I'm not crashing, just having performance issues.

[KristopherKerblumbus]

DXDiag: http://pastebin.com/WnkPxXGY

settings.cfg: http://pastebin.com/uz4gCH1D

Craft files: https://www.sendspace.com/file/n7t5oi

[KristopherKerblumbus]

Anybody?