Extreme lag/slowdown during/after "tippy" landing

[eataTREE]

Version: 25

Hardware: Apple iMac 12.2, 4-core Intel i5, 4GB RAM, video describes itself as "Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6730M/6770M/7690M XT]"

OS: Linux Ubuntu 14.04 LTS w/kernel 3.13.0-37-generic #64-Ubuntu and flgrx 13.35.5 driver

Mods: Uh... lots... Karbonite/MKS, FinePrint, MechJeb, Infernal Robotics, KAS, RemoteTech, ScanSat, RasterPropMonitor... however, the bug appears to manifest independently from whether the craft uses modded parts or not.

Reproducibility: ~50%

Problem description:

At or close to the surface during landing, KSP becomes almost unresponsive and the system hangs for seconds to minutes at a time. This seems to occur more often with "tippy" landers that have a lot of rotational forces being applied, and is more likely to occur when landing on a low-gravity body, however, I have also observed it when landing on Kerbin after a bad landing while the craft was struggling to stay upright using SAS and reaction thrusters.

When this state is triggered, it persists even if I exit to the space center (which takes a long time) or switch to a different vehicle. However, if I save and quit the game (which takes several minutes) and then restart and reload the saved game, KSP goes back to a normal state.

This problem was not observed in version 24.2 on the same hardware with the same drivers and mod list.

Any ideas?

eataTREE

[Padishar]

There is, quite probably, a whole slew of constant error spam in your log. Please upload a complete player.log file from one of these sessions as described in the "How to get support" sticky thread.