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While I could enable Defer Non essential Javascript and lazyload options to boost my site, Got the following errors again and again.
1) The calculating score tabs, for desktop & Mobile, are not working. They keep rolling for several minutes and in the end got this:
“Whoops, something went wrong
Couldn’t get the site score Retry
Timed out while waiting for metrics”
2) “An error occurred while sending Critical CSS generation results to the server: Failed to fetch”