IF your having slow network on your Centos box best you check for TCP offloading issues.
tcpdump -i eth1 -v -nn| grep -i incorrect
If you get a lot of
18.104.22.168.22 > 22.214.171.124.53996: Flags [P.], cksum 0xc3d6 (incorrect -> 0xd4eb), seq 7496:7592, ack 9003, win 559, length 96
ethtool -K eth0 rx off tx off sg off tso off ufo off gso off gro off lro off
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