print-test.py

#!/usr/bin/env python3
import timeit
import sys
from scapy.all import *

def read_pcap(fname, bpf, klass=PcapReader):
    with klass(tcpdump(fname, args=["-w", "-", bpf], getfd=True)) as pcap_reader:
        for pkt in pcap_reader:
            #print(pkt.summary())
            pass

if __name__ == '__main__':

    fname = sys.argv[1] if len(sys.argv) > 1 else './test-1.pcap'

    for t in [RawPcapReader, PcapReader]:
        et=timeit.timeit('read_pcap("{}", "port 7503", {})'.format(fname, t.__name__), number=3, globals=globals())
        print('{}: {}'.format(t, et))

print-test.txt

~ ❯❯❯ ./print-test.py
reading from file ./test-1.pcap, link-type EN10MB (Ethernet)
reading from file ./test-1.pcap, link-type EN10MB (Ethernet)
reading from file ./test-1.pcap, link-type EN10MB (Ethernet)
<class 'scapy.utils.RawPcapReader'>: 3.0010140250087716
reading from file ./test-1.pcap, link-type EN10MB (Ethernet)
reading from file ./test-1.pcap, link-type EN10MB (Ethernet)
reading from file ./test-1.pcap, link-type EN10MB (Ethernet)
<class 'scapy.utils.PcapReader'>: 51.21891517401673
~ ❯❯❯ ls -lh ./test-1.pcap
-rw-r--r-- 1 km km 3.2G Mar 22 18:24 test-1.pcap
~ ❯❯❯ time tcpdump -r test-1.pcap > /dev/null
reading from file test-1.pcap, link-type EN10MB (Ethernet)
tcpdump -r test-1.pcap > /dev/null  1.63s user 0.92s system 99% cpu 2.569 total