Dashboards loading is very slow in kibana 3


We use kibana version 3. Our team has created and saved lot of dashboards. While searching for a dashboard after clicking on load , it takes a lot of time to list these dashboards.

We did change the "loader" configuration , we changed "load_elasticsearch_size": 20, to "load_elasticsearch_size": 1000, to list more dashboard while searching. Is this the reason for the dashboard search operation being slow ? what might be the best optimal value to be kept of "load_elasticsearch_size" to make sure dashboard search happens quickly ?