public Boolean isDisableParallelDownloads() {
        return disableParallelDownloads;
    }
Returns if the parallel downloads are disabled or not. By default, the value is set to false.

<p>
TransferManager automatically detects and downloads a multipart object
in parallel. Setting this option to true will disable parallel downloads.
</p>
<p>
Disabling parallel downloads might reduce performance for large files.
</p>

@return true if parallel downloads are disabled, otherwise false.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/transfer/TransferManagerBuilder.java