How to execute multiple SQL Oracle queries at once in php?

I am creating a web (html css php) that takes ORDER_ID as an input. Then it looks into several ORACLE databases and show everything on a page. I have optimised queries to maximum but still i am above 2 seconds per query.

The queries are not dependant on each other. Is there a way to simultaneously access 3 or more databases and execute queries in php ?

Or is there another way to approach this? Thanks.