Snowflake JDBC ResultSet with more than 1000 rows not reaching Client

fetching data From Snowflake privatelink account using JDBC queries , the app is running behind a restricted firewall and proxy , When we run SnowCD it shows many URL are blocked , but if we pass proxy information in snowcd then it succesfully pass all test.

Now when we run our app to connect snowflake and execute queries , those queries which returns small data executes but those who returns large data (3000 rows+) goes in waiting , and after long wait timeout error comes. Same queries works when data is small.