Avalanche, all version.
Disable "Always in Memory" when create HTTP file body.
If you select Always in Memory, the HTTP response body permanently resides in memory on the simulated server. This eliminates any file I/O that might otherwise be required to transfer the file into memory during a test. As more memory becomes permanently allocated, less becomes available for other run-time needs. The simulated server has mechanisms that detect low memory and throttle traffic from a client until memory becomes available. It is best to avoid these throttling mechanisms by limiting the Always in Memory option to those files that you frequently access.