"mem usage is over 400M", do you mean Tomcat mem size? If you don't give your cache sizes enough room to grow you will choke the performance. You should adjust your Tomcat settings to let the cache grow to at least 1GB or better would be 2GB. You may also want to look into http://wiki.apache.org/solr/SolrCaching warming the cache to make the first time call a little faster.
For comparison, I also have about 8GB in my index but only 2.8 million documents. My search query times on a smaller box than you specify are 6533 milliseconds on an unwarmed (newly rebooted) instance. -- View this message in context: http://lucene.472066.n3.nabble.com/Re-The-search-response-time-is-too-loong-tp1587395p1588554.html Sent from the Solr - User mailing list archive at Nabble.com.
