Hi @Mounika M ,
Without any details of your inbound action code or the tables you are running scripts on, there little that can be provided in the way of specifics. Delays are normally the result of queries to large tables, tables that need indexing, excessive queries, recursive queries.
What debugging have you undertaken?
It might not be just inbound action that’s impacted, have you review any system diagnostics data - slow queries, slow scripts etc, slow transactions etc.
You can refer to this troubleshooting : https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0520595
