> Or your app continues to be perfectly usable like almost all Python apps because you’re not doing something CPU-bound in unoptimized code, and you’re not seeing YouTube/Instagram-level growth.

Honestly I have yet to use a significant (like >10k line) Python app that wasn't really slow. It definitely doesn't require YouTube scale.

"Just optimise the bottlenecks" is generally a myth in my experience. Most programs are all bottleneck.