what update rate is the tool set to? it's a slider in its tool menu, too low and that fps drop happens due to it calling positioning stuff too often (custom models may also have a lot of physics bones, although i don't think that i encountered such. only had fps drops when trying to use low update rate ragdoll mover on quite resource intensive maps), i think mine is set to 0.01 and i don't have much issues, although if you have it set to that you can try 0.1, also if you set it too high then it may look not as smooth when posing stuff.

ok I gonna try 0.1, is that something in settings I can find?

yeah, some of the sliders in tool's menu should be "tool update rate", somewhere at the top of it

ok thnks anyway, gonna check it out later and close this discussion if it works. If it doesn't...still gonna close I guess

I've found that this is usually fixed by disabling collision on the ragdoll. Right click on it in the context menu and select "Disable Collisions" - and if that's not enough, try using a tool like No Collide World on it. In my experience, doing both of these virtually eliminates any lag I have using the tool.

oh even better
thnks