How to optimize large KMZ file on map in react js?

I have more than 100 200 files on google map. Its start lagging and stuck the map.

The method i already implemented and tested are

1. throttledFetchKmzData
2. debouncedFetchKmzData
3. lazy laoding and cluster loading
4. togeojson – NPM and Web Workers
   But nothing is working. How to optimize large KMZ file on map in react js?