Hi my friend,
the problem is caused by the library used to create the .exe. (https://python.plainenglish.io/python-pyinstaller-exe-false-positive-as-trojan-v...)
This is also one of the reasons the code is opensource, meaning anyone can read the code on github. To show that there are no viruses or other hidden processes.
On whether your pc "began performing better aftere delete the app," I honestly have no idea, once the download is finished and the app is closed it does nothing more