Stutter in VAB at certain camera angles, and stutter in tutorial until closing some messages

[Suseika]

$ uname -r

Linux leika 3.14-1-686-pae #1 SMP Debian 3.14.12-1 (2014-07-11) i686 GNU/Linux

CPU: Intel Core 2 Duo E6750

Video: Nvidia GeForce 8800Gt

The game runs mostly perfectly, except two situations, which feature stutter and sound crunching. First, and the most frustrating, is that it stutters in VAB, but only at certain camera rotation directions. Particularly at the default direction facing launchpad, the one that you can't change until you place your cockpit Stutter diminishes when you point your camera at the wall of VAB opposite of the entrance.

And the second thing is that in tutorals game stutters as well when some messages are popped which you can't close until you satisfy some condition. Particularly, at the asteroid rendezvous (thanks KSP for teaching me that fancy word) mission part 1, when you are asked to set your orbit to < 10 km to asteroid rendezvous point. As soon as you set the right orbit, "Next" button becomes available, and as you click it, stutter vanishes.