No subject

     "Clients can now use microdescriptors instead of regular descriptors
     to build circuits. Microdescriptors are authority-generated
     summaries of regular descriptors' contents, designed to change
     very rarely (see proposal 158 for details). This feature is
     designed to save bandwidth, especially for clients on slow internet
     connections. It's off by default for now, since nearly no caches
     support it, but it will be on-by-default for clients in a future
     version. You can use the UseMicrodescriptors option to turn it on."

So the option 'UseMicrodescriptors 1' means that you turn it on.

-- 
Runa A. Sandvik