Size of exe when using pyinstaller over 300MB for a simple script

hi, im a bit perplexed why after running pyinstaller to create an executable for a very simple script the size of the exe file exceeds 300MB. In the past ive used the python software foundation cpython implementation of python available from the microsoft store and the executable size for a previous version of this script using that implementation was 70MB (i.e. over 4 times smaller…) - the functionality of both versions of the script is more or less identical