slow app

Hello, I have a contacts creator app, I use the ContactUtils library But it is very slow Is there a way to add a large list of numbers to contacts? Or is there a faster way to add a large number of contacts? (For example, 5000 contacts)

Hi all, I am working on a project for work, basically I am attaching a DAQ (Data Acquisition System) we designed with 4 ADCs that communicate with raspberry pi over I2C communication protocol. This all seems to work fine so far, I am able to communicate with each of the ADCs and collect data...