For tests with Load Generators in the Cloud and with the Controller on premises, some configuration and tuning operations are necessary to increase the capacity of the testing environment before setting the Cloud Load Generators, as described in Select the Cloud Load Generators.
To load test with Cloud Load Generators
Open your scenario in the NeoLoad Controller.
Check the design of your scenario:
For the requests, ensure the validations, if any, are really necessary. Keep them only for the key pages whenever you can.
For the variables values, ensure the distribution policies are not Controller-based whenever you can.
Ensure the validations and the variable extractions on bulky inputs, if any, are really necessary and optimize them.
For the variables extractors:
Ensure the XPath expressions, if any, are really necessary.
Ensure the regular expressions with quantifier backtracks are really necessary.
Limit the number of Virtual Users with few requests or pages, or redesign them.