No data points issue on Grafana Dashboard Panel

Dear Team,

We are observing frequently " no data points " issue on grafana dashboards. Also data is not loaded sometimes. Refresh is rquired to upload the dashboard proporly.

Is there any recommdendation from Grafana. - How many panels we can add in one dashboards.
Below version we are using in our setup

Grafana v6.0.1 (0c44a04)
Elasticsearch 5.6.16
Logstash 2.2.x,

Please suggest ,how we can improve our Grafana Dashboard performance.

Arjun Sutar

Dear Team,

Awaiting for your support and update .