Fast delivery in simultaneous interpretation

Fast speech is the arch enemy of simultaneous interpreters. Prior preparation may address deficiencies in knowledge and terminology, and to some extent, alleviate the pressure of fast delivery. But if the speed is beyond a certain limit, no interpreter can transmit the message in full, even if the interpreter is an expert in the subject. This is even more so when the structures of the source and target languages differ substantially. The reason is simple. All interpreters have limited mental capacity.