Grafana as influxdb data source is slow after using grok pattern in telegraf , pls help any one

Hi All ,

Can anyone help me , I used grok pattern in telegraf config file to take out nginx data , now using telegraf and influxdb data source I created a grafana dashboard of nginx response for different api but my grafana is now very slow after using grok pattern , when plotted only system matrix , grafana was faster .
Pls help to do to any tuning regarding this .

Regards
Rahul