This article was well written and contained this gem, which was re-quoted by Daniel Roth [Executive Editor @ LinkedIn] on LinkedIn:

…when you have those high performers in place, cutting those who aren’t working out becomes easier. “High performers hate working with mediocre performers,” she says. “Not just low performers. Mediocre performers. So you’re devaluating your best team players by not addressing people who aren’t really cutting it for the brand.”