Which of the following is NOT accelerated by SecureXL?

sk63400
https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk63400

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The following traffic is not connection-rate accelerated by SecureXL:
•Non-TCP/UDP connections such as PIM, GRE, ESP
•Protocols that are not connection intensive such as SMTP, FTP, RPC, NFS, NNTP, NTP
•Complex connections such as IPSec VPN, FTP, H.323, etc.
•Traffic in environment using NAT (for security, NAT addresses can change and can be shared)

There is more to it than the above.. check the link to sk63400