[melipla]

Display connections:
fw tab -t connections
Display connections summary:
fw tab -t connections -s

I would probably suggest a different approach:

fw monitor -e "accept;" -o connections.cap

And then use Wireshark to examine the connections.cap. If your current connections is @ 39,900 that means you've hit the limit of your connection pool. As 40,000 connections isn't that many, I would suggest increasing to 80,000. Decent sized hardware should be able to keep up...unless you hit that Active tab on Smartview Tracker, then all bets are off.