Optimize & refactor index.js

[Neilblaze]

The model generally takes around 5 seconds to initiate in most scenarios. This speed is device dependant, but in some cases, the preview doesn't populate in some of the older devices. Optimize it to load in low spec devices & or add a modal popup for devices that fails to load/run it.

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[subhangi2731]

can you please assign this issue to me? @Neilblaze

[Neilblaze]

@subhangi2731 Go for it! 👍
Make sure you follow the proper contribution guidelines.

[Neilblaze]

@subhangi2731 are you still on it?