Yes it does.
I think I have DiffusionBee installed but I haven't updated it for months
Doubtful. As an example, OpenAI released Triton, a programming language explicitly for optimizing models. For the scale they're at they'd be crazy not to throw an engineer or two at optimizing the models they're going to send to production.
I would bet that we can do better than GPT3 with less computing resources but that would need a different model architecture.
Our brains outperform GPT-3 with only 30w of power. The potential for software optimization may be many orders of magnitude.