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I bought KSP a few weeks ago, downloaded the 1.2.2 Linux-64 version, and I've been enthusiastically building and launching ships in sandbox (haven't started a career or science game yet). I've noticed that if I build a ship with more than 60 or so parts and then launch it immediately, or even if I restart the game and go direction to launch pad with a ship over about 80 parts, I get nearly constant "yellow clock", which I've read indicates frame rate lag. A few times, I've had frame rate (or other) lag so bad that keyboard commands or mouse clicks wouldn't catch on the first try, or require holding a key to take effect -- which can result in overcontrol bad enough to tumble a rocket during launch or cause other disasters. As far as I can tell, my computer is well above minimum requirements; I have a Core2Quad 2.67 GHz, 8 GB Ram, and a 1 GB nVidia GTX950 video running the nVidia proprietary drivers version 367.57 (not the generic "open" Linux drivers), in a PCI-E x16 expansion slot (my monitor is 1280x1024 with VGA connection; it's on the old side, but that shouldn't affect frame rate). I'm running Kubuntu 14.04 LTS 64-bit, kept updated daily, and generally don't have performance problems; among other things, i can run Path of Exile under Wine at a playable frame rate (and could when I had only 4 GB RAM installed), have no trouble editing large images in GIMP, though I do get some lag issues with streaming video that I believe are more to do with my data connection than my hardware (they got worse when I moved and lost a 1 Gb/s fiber to the house connection, replaced by my current 300 Mb/s TV cable connection). Again, connection quality shouldn't affect a game running locally, within my own machine. My OS and KSP install are on an SSD connected via SATA (not sure what SATA version my motherboard supports, but the SSD is quite noticeably faster than the platter drive it replaced). What do I need to look for as a source of my seeming poor performance? I'd like to add some mods, a setup similar to what Scott Manley was running when he recorded his Interstellar Quest videos for YouTube. What do I need to fix to handle higher part counts (stations, assembled-in-orbit large interplanetary missions, etc.) along with a reasonable set of mods along those lines?