Hi @pierreguillou ,
Thanks for the detailed explanation. That’s indeed a miscommunication on our part. The acceleration part is indeed only available for customers (starting at the PRO plan).
We’re going to remove the Accelerated keyword as it’s definitely misleading right now.
For an estimate though you should expected 20% increased speed out of the box for T5.
What I was referring to when saying we’re usually able to go beyond the default  means acceleration is something that is complex.
The default acceleration should work great out of the box, but more acceleration is usually possible given your constraints. We’re able to adapt hardware and software to maximize efficiency.
T5 is a great example as it’s able to do translation, summarization and other tasks. If you are using it as a summarization of very long texts, or in translating short sentences, we can optimize it differently and get different performance boosts. So the default cpu+optimized you will see might not reflect the ultimate performance we can reach if you want to use the API in your products.
If you are interested in using the API at scale, we’re usually recommending starting a discussion at api-enterprise@huggingface.co where we can ask a few questions regarding the intended use (model+ typical usage) and from there we can optimize a model specific to your usage.
Does that answer your question better ?