Hi Mantri Shekar,
The time is taken because of lots of library loading and odata call to fetch the data. You can use many performance improvement methods.
One way is to use cache buster. Another way, if you dont want to make the chart visible before service is loaded, Make the visible false and once the service success , make it visible.
https://help.sap.com/saphelp_nw75/helpdata/en/91/f080966f4d1014b6dd926db0e91070/content.htm
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