Need Cron Job Parsing JSON from API, Inserting in to DB

Project Description:

The Project is to prepare a Cron Job with an adjustable interval in seconds and milli seconds. Cron Job adds requesting an API and then parsing the JSON and inserting it in to a DB tables on the server. The critical aspect for me is Performance. I already tried with SQL and PHP but still i need better performance. So I am not particular about the scripting language and query language but I want a robustness and very little latency. The JSON contains just Key values not a document. So parsing plays important role.

Skills required are C# Programming, Javascript, C++ Programming, PHP, Python