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Rochelle - Vanilla+

Okay, here's some clarity. Rochelle will still look normal if you download this. The only difference is that when you're further away, the game will use less polygons for her - which is something the game already does with the L4D1 survivors - making this mod more focused on optimizing. The game didn't do this before, which is bad.

This is a model mod. Other Rochelle mods that replace the model will conflict. Texture mods for Rochelle work fine.

To summarize, Rochelle's been modded to have better LOD, (Level of Detail,) which means this will give you a better performance.

For details:

Rochelle didn't have many issues. Her weights were probably the best of all the L4D2 Survivors. I only had to make a few adjustments for incorrect weight percentage here and there, but it's so minor that it wouldn't be that noticeable.

Just like Nick, Rochelle's regular LOD models never actually decreased the polygons.

Rochelle has 17,130 tris, or polygons. The game also uses that for her shadow, basically doubling the poly-count to 34,260 tris!
With this, not only does her model decrease poly-count the further away you are from her, her shadow uses a low-poly model of 2,864 tris. This means that even when you're using the highest model from her, she'll still only render 19,994 tris, which is a 14,266 difference of polygons being saved!

LOD 0 - Highest poly-count model. (17,130)

LOD 10 - Fingertip bones aren't used. This is the default model used when model settings are Low. Poly-count is the same as above.

LOD 15 - Hair detail + others removed. Some fingers' bones are removed. Overall poly-count lowered ~20% (15,072)

LOD 25 - Facials removed. Fingers removed. Overall poly-count lowered ~60% (6,261)

LOD 40 & Shadow LOD - Hand bones aren't used. Earrings & bracelets removed. Overall poly-count lowered ~80 (2,864)

Before this mod, if you had all L4D2 Survivors rendered with their shadows, you'd get 125,328 polygons total.
If you have this mod and the other Survivors, you'd get 74,958 polygons. That's a 50,370 difference just from the lower-poly shadows alone!