Hi @usha jyothsna ,
I have never met this issue before. In SharePoint 2016, I have some pages inserted with js code through content editor web part. But all these pages works well.
For your issue, have you tried use other browsers? And here is an article would be hepful to you to troubleshoot this issue: https://mashtips.com/fix-page-unresponsive-error-chrome/
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