Horrid performance since 0.90?

[TechnicalK3rbal]

Since (finally) updating to version 0.90 of KSP, I have been getting both incredibly low framerates ( < 20 average, as per Nvidia Shadowplay) and spontaneous crash to desktop. So it is playable "vanilla"/stock, but not well. (Next part is modded, but the first part wasn't, so I'll put it in the same thread to avoid double-post/clutter. Feel free to move it, if necessary. ) Since 0.90, I have not been able to start KSP with any mods.It just crashes, (presumably from lack of RAM, given my amateur knowledge of the format of the log files.) Also, stock or not, my CPU is constantly at > 90% use, and > 150 degrees f, as well as in excess of 4000 RPM on the fan, causing it to be (for obvious reasons) very loud and leaving me afraid something is going to fail catastrophically. Are there any fixes for the performance, instability, and crashes, and general low performance of the new version? I can post specs if need be.

Edit:

Windows 7 x64 (game is x86)

V. 0.90

AMD Athlon x4

Nvidia GTX ^50

Crash Log here (Not sure if with mods/without) https://www.dropbox.com/sh/18kbe0ffcyvk6ph/AAB6zI4cJ-KdoFPUq3qzHiAaa?dl=0

Edit2: Spelling

Edit3: 6GB RAM

Edited February 10, 2015 by TechnicalK3rbal