Nothing should be removed, period.
I don't care how hard you want to batter the textures/items into shit, that is fine by me. I do care that you are removing some entirely. Make bushes one shade of green or whatever if you absolutely have to. Just don't remove them, or anything else lol. Are you saying that your computer will explode and your fps will drop to a crawl if you have a few extra bushes on a map? Jesus Christ.