Never see the tps as low as 25, out test servers are not strong, but still be able to reach 1000 tps for simple calls.
As Dirk said, it's very dependent on the environment,
- is it software gateway, or appliance gateway
- standalone server or gateway cluster (how many nodes)
- what kind of (physical) server the gateway is running on (I hope it's not running on a laptop)
- how many cpu/mem of the server
- audits are not recommended for performance test and production, is it disabled
- if the audits are enabled, what's the size of the ssg database
- any external connection for the test APIs (ldap, backend apis, etc.)
- what's the front end response time and back end response time
...