Optimise speed of json translation (from Japanese to English)

Hello everyone :wave:! The task is to translate a JSON array from Japanese to English. An example of the instruction is below:
Translate to English. Keep the JSON structure the same after translation. Return just the JSON, without any text around.

An example JSON is below:

I notice that with a relatively small size of the array and the elements themselves, the translation through the API (Chat completions gpt 3.5, gpt4o) takes a noticeable amount of time (10-15 seconds). In the web interface of ChatGPT, it works noticeably faster (3-4 seconds). How can I optimize the speed? Are there any OpenAI API parameters that can be adjusted? Or are there special solutions (like other LLMs) for working with JSON? Or should I “give up” and use the good old Google Translate?

Thanks for your post.
But the example JSON seems to be empty.
If you could provide an actual example, it would be helpful for us to advise you!

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