Phonegap / Cordova ungzip files in the file system

Our application downloads 25MB of files from the server and then unpacks them using the cordova plugin. The problem in unpacking is slow.

Plugin: http://plugins.cordova.io/#/package/org.chromium.zip

Has anyone found or created a plugin that can unpack rather than unpack? We found tar -zx to be about 200% faster than unzip - a huge savings on the phone. For us, this would mean a saving of 10-15 seconds for the user to be able to unzip these files.