IPS throughput

I bought a XG125 this year , and have a spec question. XG125 has high performance numbers as below :
Throughput 5,000 Mbps
IPS 1,000 Mbps
Concurrent connections 6,200,000
New connections/sec 35,000

I read the datasheet of XG125 , cannot find the testing critria note.
Like fortinet datasheet NOTE , IPS performance is measured using 1 Mbyte HTTP files , and Concurrent connection too.

I just wonder in what condition , XG series has this high score numbers?

Fortinet NOTE :

Firewall Throughput (1518 / 512 / 64 byte UDP packets)

Note: All performance values are “up to” and vary depending on system configuration. Antivirus performance is measured using 44 Kbyte HTTP files. IPS performance is measured using 1 Mbyte HTTP files.