Assuming you have a PCAP called test.pcap and the Packet Café service running, the following will give you performance of making 1000 POST requests with that PCAP the the service:
$ time for i in {1..5};do curl -s -w "%{time_total}\n" -o /dev/null -X POST -F '[email protected]' -L http://0.0.0.0/express-upload; done | datamash max 1 min 1 mean 1 median 1
0.007211 0.001175 0.001631667 0.001535
real 0m7.608s
user 0m2.062s
sys 0m3.450s