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Let's see, what helps:

  • CPU: Speed is nice, to process possible lot of data. many cores is less relevant since processing is serial by nature.
  • Memory: By default Wireshark tries to do a lot of analysis, gobbling up memory, so for larger captures more memory is better.
  • Disk Speed is nice, to be able to keep up with fast networks, if that's your thing. Also size depends on you capture needs.
  • Interfaces: pending on your capture needs, a fast interface is nice. Ethernet should be no problem, though USB-Ethernet may be hit or miss. A good wireless capture interface, with capable driver to capture with maybe somewhat hard to find.