Do mods slow down KSP?

[kiwiak]

So above sertain limit game starts to crash, but within this limit, is there difference in performance?

Im not talking of parts count on specific vessel, just whole amount of mods loaded inside ksp, is there difference for example with 1gb of mods and 2gb.

[biohazard15]

Part packs generally doesn't slow FPS, although if such pack uses large detailed textures, it can.

Plugins, on the other side, require some amount of system resources. For example, MechJeb may slow down FPS if you open many windows. Or SCANSat - it's like 5 fps during map rendering process (It won't lag once render is complete though).

[SRV Ron]

Mods with lots of parts do slow down loading time. Any other slowdown depends on the ship and the texture details.

[Sirrobert]

As far as I know the only thing that effects performance is textures, and part count.

So the mod universe replacer might give you a little performance hit because it makes everything look more detailed.

So the overall conclusion is 'no'

[Red Iron Crown]

For plugin based mods, it depends entirely on how computationally expensive it is. The n-body physics mod, for example, would have a significant effect, I think.

For most common mods, the effect is small or negligible.

[cantab]

I found the KER Flight Engineer seemed to slow things down, though it's always hard to be sure. Performance is marginal on my system anyway.

[Taki117]

From my experience with mod overload (90+ mods) as long as you are below the memory threshold and you have a reasonable part count you won't lag. You may experience a slight pause when moving within render distance of a station or other large part count ship.