Hi @sabari M ,
you need to perform a performance tuning on your side. Here an usefult article https://confluence.atlassian.com/jirakb/troubleshoot-performance-issues-in-jira-server-336169888.html
We don't know your server capabilities and your settings so we can provide you a correct path to fix your issue. Moreover you could ask support to Atlassian team through https://support.atlassian.com/contact/
Fabio
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