By default the example Solr application included with version 1.4.1 takes two minutes to process documents sent to the index. I've seen other servers configured to take 3+ minutes. Where can you change change this to zero or 15 seconds?
You need to adjust autocommit option in your solrconfig.xml. By default its:
<autoCommit> <maxDocs>2000</maxDocs> <maxTime>120000</maxTime> </autoCommit>
maxTime is what you need, it's in miliseconds.