nmap run slower in docker

Describe the current behavior
A clear and concise description of what the bug or current behavior is.

hello ,I use follow code to scan an ip

import nmap
nm = nmap.PortScanner(nmap_search_path=PortScan.nmap_search_path)
nm.scan(hosts=ip, arguments='-Pn -T 4 -sV --version-intensity=3 -p 1-65535')

when the code run outside docker,it takes a few minute(less than 5 minutes)
but when code run in docker,it takes more than 20 minutes

Expected behavior
Describe what you would like to happen instead.

how can I do to make nmap run in docker takes fewer minute

No repository file or test is named. Start by reproducing the Python nmap.PortScanner scan with the supplied arguments inside and outside Docker, then compare the runtime and identify what Docker-specific condition accounts for the difference. Done means explaining the slowdown and verifying that the scan completes within the expected few-minute range in Docker.