Onuralp

I just started a new modded career in ksp 1.12.5 . And i want to send a carrier to laythe . I built a carrier it has 600 parts. But my game lags too much and low fps too . I cant land with this lag. I tried dela time thing but its not effected . Installed ubizour weld mod but its not work on this version of the game . What im gonna do ? My pc specs are i5 7500 gtx 1060 with 16 gb ram. Please help me.