Hi Sergio,
Okay, so I get that you are making a call during the initialization of the app, which returns you a JSON reponse, and this call is is taking some time.
So, how much time is the processing of the JSON response on the UI side taking ?
I assume this is taking a while, and the download of en_json is a result of something during the processing of this response.
I think the issue that you see around blocking the screen is not really the download of the en.json, rather what is happening before that . Could you check that part?
So the time that you see until the start of the en.json file here seems like the total time taken for the network call + response processing.
Regards
Radhika