Hi:
Sorry, I just translated your question by google, I hope I had understand it.
1 the 5mins interval is displayed on the overview page, just to lower the press of the server when refreshing data.
2 In fact, the IAMMETER-cloud stores the data every 1 min now, we may extent the storage time in the future to 2mins or 5 mins, but now, it indeed storage data each min.
You can view the data here ,or export the data in csv file.
If you need more fast uploading , you can also consider use your own server or
https://www.iammeter.com/docs/own-system
poll the data via modbus tcp directly
https://www.iammeter.com/newsshow/news-modbus-tcp-energy-meter