Slow performance after switching to HEREMap premium SDK

I am facing performance issues with HEREMap Premium Android SDK in my react-native project. Previously I was using free version of HEREMap, and my map view was performing very well. But once I switched to Premium SDK, view rendering became very slow.

Following were the only changes I did for premium SDK integration,

1. Invoke setIsolatedDiskCacheRootPath api before MapEngine.getInstance().init
2. Update licence key information in app/src/main/AndroidManifest.xml

Am I missing something? please help.