Could you provide some high-profile examples where the SaaS implementation is much more performant than the OSS variant? Genuinely curious... I figured the SaaS

Could you provide some high-profile examples where the SaaS implementation is much more performant than the OSS variant? Genuinely curious... I figured the SaaS vendors (mostly) use OSS under-the-hood anyways, and then they have to take their overhead and profits, etc.