So I seem to be having an issue where certain parts tend to lag when I'm in the VAB/SPH. I saw someone else seemed to have a similar issue earlier, however in my case the fps drop occurs with only a single part, but it seems to be inconsistant as only certain parts seem to cause the drop, those being select crew capsuals (mostly modded) and the Mk1 structual fuselage of all things, but none of the command pods seem to lag at all, as it did in their case.
I'm not too sure about their conslusion about it being only related to mod count, seeing as the fps drop only ocurrs when DangIt is installed, not to mention I'm currently running a rather "small" modpack, running only about 30 actual part packs (normaly I'm looking at 50+ part packs), so I'm not conviced it's only due to a large number of parts loaded, as I am very familar with that type of lag, and this is not that.