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Re:Nmap 7 Release Notes by mrmondo on Friday November 20, 2015 @08:07AM (#10600954)
Interestingly I find nmap 7 almost twice as slow 6 when performing the example scan from the documentation.

  # time nmap -v scanme.nmap.org # 6.40

  Starting Nmap 6.40 ( http://nmap.org ) at 2015-11-21 00:01 AEDT
  Initiating Ping Scan at 00:01
  Scanning scanme.nmap.org (45.33.32.156) [4 ports]
  Completed Ping Scan at 00:01, 0.23s elapsed (1 total hosts)
  Initiating Parallel DNS resolution of 1 host. at 00:01
  Completed Parallel DNS resolution of 1 host. at 00:01, 0.00s elapsed
  Initiating SYN Stealth Scan at 00:01
  Scanning scanme.nmap.org (45.33.32.156) [1000 ports]
  Discovered open port 80/tcp on 45.33.32.156
  Discovered open port 22/tcp on 45.33.32.156
  Discovered open port 31337/tcp on 45.33.32.156
  Discovered open port 9929/tcp on 45.33.32.156
  Completed SYN Stealth Scan at 00:01, 26.27s elapsed (1000 total ports)
  Nmap scan report for scanme.nmap.org (45.33.32.156)
  Host is up (0.20s latency).
  Not shown: 993 closed ports
  PORT      STATE    SERVICE
  22/tcp    open     ssh
  80/tcp    open     http
  135/tcp   filtered msrpc
  139/tcp   filtered netbios-ssn
  445/tcp   filtered microsoft-ds
  9929/tcp  open     nping-echo
  31337/tcp open     Elite

  Read data files from: /usr/bin/../share/nmap
  Nmap done: 1 IP address (1 host up) scanned in 26.54 seconds
             Raw packets sent: 1067 (46.924KB) | Rcvd: 1054 (42.164KB)

  real  0m26.546s
  user  0m0.061s
  sys 0m0.046s

# time nmap -v scanme.nmap.org # 7.00

  Starting Nmap 7.00 ( https://nmap.org ) at 2015-11-21 00:02 AEDT
  Initiating Ping Scan at 00:02
  Scanning scanme.nmap.org (45.33.32.156) [2 ports]
  Completed Ping Scan at 00:02, 0.19s elapsed (1 total hosts)
  Initiating Parallel DNS resolution of 1 host. at 00:02
  Completed Parallel DNS resolution of 1 host. at 00:02, 0.00s elapsed
  Initiating Connect Scan at 00:02
  Scanning scanme.nmap.org (45.33.32.156) [1000 ports]
  Discovered open port 22/tcp on 45.33.32.156
  Discovered open port 80/tcp on 45.33.32.156
  Discovered open port 9929/tcp on 45.33.32.156
  Discovered open port 31337/tcp on 45.33.32.156
  Completed Connect Scan at 00:03, 46.61s elapsed (1000 total ports)
  Nmap scan report for scanme.nmap.org (45.33.32.156)
  Host is up (0.19s latency).
  Other addresses for scanme.nmap.org (not scanned): 2600:3c01::f03c:91ff:fe18:bb2f
  Not shown: 992 closed ports
  PORT      STATE    SERVICE
  22/tcp    open     ssh
  80/tcp    open     http
  135/tcp   filtered msrpc
  139/tcp   filtered netbios-ssn
  445/tcp   filtered microsoft-ds
  5815/tcp  filtered unknown
  9929/tcp  open     nping-echo
  31337/tcp open     Elite

  Read data files from: /usr/local/bin/../share/nmap
  Nmap done: 1 IP address (1 host up) scanned in 46.85 seconds

  real  0m46.858s
  user  0m0.801s
  sys 0m0.233s
Re:Nmap 7 Release Notes by bonsaiviking on Friday November 20, 2015 @10:10AM (#10601495)
Your second command is using TCP Connect scan (-sT) instead of SYN scan (-sS). Not sure why it would be doing this, but add -sS and see if speed difference is better.
Re:Nmap 7 Release Notes by pbhjpbhj on Friday November 20, 2015 @08:50AM (#10601114)
Did you test more times to rule out throttling at the server end? Or does v7 have a longer default delay between probes?