After container startup, SSP download and installation represent the next biggest chunk of time in our test setup that might yield substantial optimizations.

Some ideas:
- Cache SSPs and pre-install them  (but can the SSP be different per test?)
- Change the mounting scheme so that we can download and unzip SSPs into a cache, then just mount them from that cache as needed
-  Worst case, just cache the SSPs locally and unzip the right one into each test (Still saves download time, if not installation time).