Performance issues. Everybody had them once, and more :)
If you are using Windows 2012+ and Powershell, you can use the Get-Counter command in order to provide you more information regarding the TCP connections.
In the example below, we are getting the counters for IPv4 TCP:

 

Get-Counter -Counter \TCPv4\*

 

This will give an output like this:

Timestamp                 CounterSamples
---------                 --------------
05/01/2017 19:39:23       \\btp154713\tcpv4\segments/sec :
                          208.768490989083

                          \\btp154713\tcpv4\connections established :
                          62

                          \\btp154713\tcpv4\connections active :
                          1085102

                          \\btp154713\tcpv4\connections passive :
                          239537

                          \\btp154713\tcpv4\connection failures :
                          742269

                          \\btp154713\tcpv4\connections reset :
                          7988

                          \\btp154713\tcpv4\segments received/sec :
                          105.882583946617

                          \\btp154713\tcpv4\segments sent/sec :
                          102.885907042467

                          \\btp154713\tcpv4\segments retransmitted/sec :
                          3.9955692055327

Quite interesting isn't it? :p Do you want to have statistics during, for example, 10 seconds? Use the sampleInterval option:

Get-Counter -Counter \TCPv4\* -SampleInterval 10
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