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Extremely low FPS when looking at surface of Duna



I am doing a manned mission to Duna and back. I have only one mod installed, which is Kerbal Alarm Clock. Here is my problem: when I am looking out into space from Duna orbit, FPS is excellent. When I look at Duna's surface, FPS crashes down to about 3 FPS.

Here are my graphics settings:


My "Max Physics Delta-Time per Frame" is 0.04; I have tried lowering it to 0.03 and even tried 0.12, and all attempts have resulted in no improvement.

My computer specs:

  • CPU: Intel i3-3120M (4 cores, 2.5 GHz)
  • Integrated graphics (Intel HD 4000)
  • 6 GB RAM
  • OS: Xubuntu 18.04 (Linux)

I have tried launching the 64 bit version of KSP, which resulted in the same amount of lag. I have also tried lowering the texture quality to 1/8. Moreover, I have tried disabling V-Sync and setting the pixel light count to 0. The game has been reinstalled, to no avail. Furthermore, I have noticed that CPU usage decreases when I look at Duna, which makes absolutely no sense at all, considering the extreme lag.

Is there anything else I can do to get rid of this horrendous lag? It is difficult to land and takeoff with the lag. Thanks for any help!

Edited by TheWildDefender
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15 hours ago, Xd the great said:

Is the alarm clock compatible with your version? Can you upload the log files for us to see?

I am highly positive that Kerbal Alarm Clock has nothing to do with my lag. The only reason why I am posting in this category is because of that one mod (and currently 2, with Kerbal Engineer Redux). Kerbal Alarm Clock works perfectly fine for me, with no error messages, so I assume that is the correct version (or at least a version that works). Even without Kerbal Alarm Clock, the lag occurs.

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