How to unlag?

So basically lower the settings, noted, thanks @MirazAerospace, @Dereric, @jrzspace, and @SamTheFox! :D

for my device, you can turn down the max loading distance (LOD) and turn off heat vapor trails

It depends on your device. I have intel celeron cpu and 4gb ram(upgraded from 2gb) and default anti virus software( I wish I could remove the Windows Defender for good). Just lower the settings until you are satisfied.

Deactivate Visual Effects and lower the Orbit line resolution and the LoD, that alone can bring the fps from 12 to 35.

And crafts with an high part count or huge vizzy programs can have an high impact.

And leave the Start area (DSC/DDB), after round about 10km, several players mentioned that after 10km the game runs 50% faster.

decrease graphics i guess