var totalDownloadTTFB madmin.TimeDurations
			for i := 0; i < len(throughputHighestResults); i++ {
				errStr := ""
				if throughputHighestResults[i].Error != "" {
					errStr = throughputHighestResults[i].Error
				}

				// if the default concurrency yields zero results, throw an error.
				if throughputHighestResults[i].Downloads == 0 && opts.concurrencyStart == concurrency {