What is the fastest programmatic tool to copy the values of a csv file into an excel tab? [closed]

I have a csv file that’s generated via a complex python process.

I have an excel sheet with a number of graphs/pivot tables etc that is based on those values, as stored in a raw_data tab.

What is the blazing-fastest-way to copy the values of a csv file into a specific Excel tab of a given existing template file (without touching the other tabs)?

Note; I don’t want to user PowerQuery – I want to use a scripting tool (i.e. python, rust, shell script, etc). openpyxl is too slow for the number of rows I have.