I had something similar years ago, mainly when turning ship/character view I had a delay. I found I had AdvancedWorldSettings / ViewDistance at 40km distance and turned that down and haven't had a problem since.

Hi, for me it's always something in the world that is lowering the SimSpeed, a grid, Script or Mod and I just create a "Testing copy" that I load to delete one grid at a time to help me pinpoint the one causing problem.

How to test a world :

1 - Select your save.
2 - Click the "Save as" button on the left.
3 - Change the save name to create a *copy.
4 - Load the copy and start deleting one grid at a time and keep an eye on the World stats Shift+F11.

*copy
Never test with your original save, better create a copy and fix the original save when solution found in the copy, this way you will not mess up your save.


____

You should share your save here so all can help you find the cause.

How to share a world save on the Workshop :

1 - Select your save.

2 - Click the "Publish" button on the left.

3 - Choose a proper Tag, check Steam upload and click the OK button.

4 - Your world will be uploaded to Steam Workshop.

5 - Paste the Workshop item link here.

Shuttering in buggy SE engine is most likely that your storage cannot keep up with map loading / asteroid loading.
Some SSD have problems with games like SE.
Always install games on separate SSD drive and NOT on system SSD drive.

引用自 Rusted Droid：

Shuttering in buggy SE engine is most likely that your storage cannot keep up with map loading / asteroid loading.
Some SSD have problems with games like SE.
Always install games on separate SSD drive and NOT on system SSD drive.

Not sure why you think so because I only have 1T SSD in my PC and the game runs very well, also never crashes, well it can crash only when I test broken/confilcting Mods.

It can't be grids or asteroids loading, i'm not moving and there aren't more than 3 grids total in the world entire. It might be mods, but i don't know why it's inconsistent. I'll turn scripts off and see if it helps.

The best when playing modified is to create a new world set creative mode to test faster and see if the same, don't mess with your original save, testing a new Vanilla world will give you that first clue.

Still having this problem. New creative world in empty space scenario, 1 Beowulf ship pasted from workshop (with it's 2 connected fighters), only grids existent, in Station mode. Limited mods not used yet, and already it's doing the stutter, which according to F11 reports means that Server CPU Load keeps going to over %400 usage and then dropping, repeating every second or two constantly. Makes game unplayable when this happens.

Share the Blueprint link here, I will load to see if it lowers the world Simulation speed and FPS.

Some creations can use a lot of high PCU value blocks that will lower the World Perfo.

OR

Try a Mothership I made that got 10 small Drones inside its hangar and a good Perfo, to see if OK for you.

Completely Vanilla :
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1637708042

Processes running in the background and/or desktop. Anti-virus scanning, etc.
Check those.