We should cache the returned audio file from the TTS engine, and use this cached file unless the parser variables have changed.
This investigation should:
- Identify if caching a lot of audio files is feasible
- If so, what are the specifics of caching? (where, access, expiry, purging etc.)
It would be worth asking the team ( Data-Persistence ) who looks after object caching (I think it's Swift we'd be using for audio file storage) for their input.