Everytime a new model is created I get a pretty decent performance spike. I know this happens with most Q menu items, but it is also happening with models that should be precached, such as wooden board gibs. For example, if I play a HL2DM map, and break a box with my crowbar, I get a good two seconds of lag before the wooden gibs spawn and I can continue.
I did not used to get this problem, it started happening recently and this is a fresh Garrysmod install on a new computer with brand new drivers. My system specs are completely irrelevant to the issue because they well exceed the requirements to run Source at maximum settings. I do not get the same issue if I simply load HL2DM and break a box, or any other Source game for that matter.