Solr default rows number is too high

Currently the Solr query index retrieves 100k items at a time from the Solr native result set, this was set high to try to keep the no. of calls to Solr (going on the wire) at 1, however in most of the cases it seems too high, causing the Solr instance to retrieve many docs (and consume memory), the repository and Solr servers to exchange such significant amount of results over the wire, the Solr index to cache (for a short time) a huge no. of docs.
Something like Lucene current default (50) should be better.