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Superlatives are problematic because for instance "fast" is relative to something and that something might change over time.

Superlatives are usually challenged and you will require proof. The proof itself can also be challenged. Suddenly you are spending a lot of time.

I would rather say: "SIMD math library" rather than "Fast library".

"Faster" is technically a comparative, not a superlative. Otherwise, sound advice.

Right, superlative is not the right term. "Fastest" would be the superlative, and is not in use.

I am just generally against referring to software in absolute terms like: simple, fast, friendly, lightweight, etc. since it can be misleading.

I consider a good practice to separate facts and opinions to achieve clear communication. Passing opinions as facts is dogmatism.