List all files inside box folder

 The sample code you provided should return the items in a folder, which will include both folders and files.

The example below from our Java SDK documentation shows how get all folder items, and then check if each item returned is a file or folder. 

BoxFolder folder = new BoxFolder(api, "id");
for (BoxItem.Info itemInfo : folder) {
    if (itemInfo instanceof BoxFile.Info) {
        BoxFile.Info fileInfo = (BoxFile.Info) itemInfo;
        // Do something with the file.
    } else if (itemInfo instanceof BoxFolder.Info) {
        BoxFolder.Info folderInfo = (BoxFolder.Info) itemInfo;
        // Do something with the folder.
    }
}

Is this this only method to get the meta data (name, size, etc) of all the files in a folder?

I ask because I am using it to traverse a few directories and it is VERY slow.

Is there perhaps a single "ls" (unix cmd)  equivalent that is faster than having to enumerate each FileInfo?