Adding transformation in the Apigee Edge through Node sometimes slows down the speed of loading

[springday2005]

I have a Node.js in Edge to transform data from a remote server. But when I check the speed of loading, it varies significantly every time. Sometimes it shows 2 sec or less, sometimes more than 30 sec. I was testing with both the browser and Curl command. Any good method to overcome this impediment? Thanks in advance.