'React app shows whilte scree for 2sec on google PageSpeed Insights?

I am trying to improve score on google PageSpeed Insights but for few second my screen shows white i don't know why, so my question is how to fix this2 sec white screen and speed index as you see in below screenshot.

Thanks

enter image description here

reactjscreate-react-apppagespeed-insightsgoogle-pagespeed-insights-api


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