I'm sure he meant testing performance of a VM is tricky, but in actual fact, both are true. Using a VM for the test client is just as susceptible to the issues

I'm sure he meant testing performance of a VM is tricky, but in actual fact, both are true. Using a VM for the test client is just as susceptible to the issues mentioned as running it as the server. As the article suggests: know your load generator client. This is difficult if it's not consistent.