How do I diagnose what plugins are causing stuttering?

[Lord Aurelius]

I just recently updated several mods after being notified by avc (didn't pay close attention so I don't remember exactly which ones) and now the game stutters while focused on any vessel in flight. The game ran fine before and still runs fine in the VAB/SPH, in the menus, on EVA next to a craft, etc. The debug log doesn't really appear to show anything, but the game freezes about once a second for about a half second and resumes, making the game nearly unplayable.

Are there some tools on the debug menu I'm overlooking that might help diagnose this, or alternatively, has anyone else recently had this issue come up (within the last few days) and identified what was causing it?

[ExEvolution]

Thats the Unity Garbage Collection running AFAIK, the stuttering gets worst the closer you are to the memory limit

[Lord Aurelius]

The stuttering seems to be pretty consistent regardless of how long I leave the game running (I'm still a few hunded MB below the limit) and it didn't start until after I updated some UI/plugin mods. Note that it doesn't show up in EVA right next to a vessel, only when I'm actually focused on a vessel so all the same parts are loaded in both cases.

[basic.syntax]

You might have to temporarily remove some mods, to isolate which one it is.

Check out this thread, some of the folks there are typing about similar issues.

[NathanKell]

Check output log to see if something is throwing exceptions. Since those get logged to disk (and Unity logging is _insanely_ expensive) that will cause stuttering.

[danfarnsy]

Basic.syntax, thanks for the link. I'm having the same issue and my log has entries like this:

[EXC 10:08:06.907] NullReferenceException: Object reference not set to an instance of an object

FerramAerospaceResearch.FARGUI.FARFlightGUI.FlightGUI.FixedUpdate ()

[EXC 10:08:06.932] NullReferenceException: Object reference not set to an instance of an object

FerramAerospaceResearch.FARGUI.FARFlightGUI.FlightGUI.FixedUpdate ()

[EXC 10:08:06.957] NullReferenceException: Object reference not set to an instance of an object

FerramAerospaceResearch.FARGUI.FARFlightGUI.FlightGUI.FixedUpdate ()

[EXC 10:08:06.976] NullReferenceException: Object reference not set to an instance of an object

FerramAerospaceResearch.FARGUI.FARFlightGUI.FlightGUI.FixedUpdate ()

Then it switches to complaining about a different mod instead of FAR:

[EXC 10:08:13.712] NullReferenceException: Object reference not set to an instance of an object

Clouds.Clouds.Update ()

[EXC 10:08:13.713] NullReferenceException: Object reference not set to an instance of an object

Clouds.Clouds.Update ()

I'll follow the other thread and post more there, if I can't find a solution in that thread.