Huge LAG when looking to Duna surface

[SamuelDeboni]

The title says it all, I'm having a huge fps drop when I look to the surface of Duna, there is no lag on the map screen and the the fps start to drop at below 70km of altitude. The lag only happens on Duna, on Kerbin and other bodies the game runs normally.

I'm using kerbal 1.6 with no mods and the turned down almost every graphics settings.

My system:
Intel Core i3-3110M @ 4x 2.4GHz
4GiB of RAM
Intel HD Graphics 4000
Kubuntu 18.04 (Linux)

[Kaphod Kerblebrox]

I experience the same on a similar system.

Ubuntu 18.10
Intel Core i5-4570S @ 2.9Ghz
8GB RAM
Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller
 

Makes landing pretty difficult, usually taking 4 or 5 tries because it's so choppy.

[Geonovast]

I had this exact issue when I started in 1.3.  Even though KSP isn't too graphics intensive, those Intel craphics just fall on their face with Duna for some reason.  It's what prompted me to get a separate GPU, which solved the problem.