LoadForge tests are almost entirely CPU dependant. They also consume network sockets though.
The performance recommendations we give are between 5000 and 10000 clients per server. Remember
that any test with more than 1 server uses a server as a controller.
For example, if you wanted to test 50,000 clients you would run:
Depending on the test size multiple workers will be spawned per server. See our Large Tests guide for more.
You can get more than 10,000 clients per server but it depends on your test. You can experiment and tweak.