Lara model (Patreon)

Well guys this is the first time i'm asking for help. I've been working on her the whole night 8 hours straight. She's rigged and ready to use. Only problem is that i'm retarded. The head had soo many polygons and i did not decimated them, and the body ain't exactly lowpoly either. So only showing the body and the rig visibles, in solid view, you try go bend her spine for example and it's laggy as fuck. I know i could use decimate for that, but it will destroy the body's auality and i just want to reduce the poly count on the face. Any ideas? <3