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Low mobile score in Google PageSpeed Insights

Can someone help me to improve mobile score?
I have already compressed images & graphics

https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fwww.objectedge.com%2F&tab=mobile

Also, how can I fix this error?
“Ensure text remains visible during webfont load”
It shows Open Sans font but I’m not using that font on the site