ODE has recently added a new option to download all of a PDS product's files through a single click. The new option is available from the product detail page of PDS products hosted by the PDS Geosciences Node. This option uses the Aspera Connect browser plug-in. Aspera technology more fully utilizes one's available bandwidth than traditional TCP connections, such as HTTP and FTP, which will improve the speed the file download speed.
Give the new feature a try and let us know how it works for you.
Example page with the option:
http://ode.rsl.wustl.edu/mars/indexproductpage.aspx?p