"When Software blades (other than "Firewall") are enabled on VPN traffic (for example, Application Control), Encrypt-Decrypt will still take place on SecureXL level (on CPU cores running as CoreXL SND), but the clear packets will be forwarded to a CoreXL FW instance for the blade's processing. All forwarded traffic related to a VPN tunnel will be handled by a single CoreXL FW instance #0, causing a bottleneck on a single CPU core on R77.30 and earlier Security Gateways. (The issue was resolved in R80.10 and later; for more information, see sk118097.) "