Performance not only depends on feature set, but also on used release version and the kind of traffic.
For Barracuda NextGen Firewall F-Series Release Version 7.0:
- FW throughput 3.8 Gbps -> measured with: Chassis throughput across multiple port pairs and large packets (MTU1500), UDP traffic
- VPN throughput 1.2 Gbps -> measured with: AES-128, NOHASH and across multiple port pairs
- IPS throughput 1.4 Gbps -> measured with: fast scan enabled, chassis throughput across multiple port pairs and large packets (MTU1500)
I guess you are looking for performance data for some kind of mixed traffic (RealWorld or IMIX), which is still not 100% your traffic but some indication for a productive environment.
F380 has around 1.1 Gbps RealWorldIpsEnterprise traffic mix with FW, App-Detect, IPS, URL-Filter, AV+ATD.
Depending on your traffic mix and packet size +/- 20%.
Please note IPS also offers fast scan mode. (Go-to: Configuration tree > box > Infrastructure services > General firewall configuration > Configuration mode "switch to Advanced View" > Operational IPS > IPS scan mode)