Array Processing in Power Automate – Tip 1


Power platform tips by OfficeLabs

Simple array processing solution in Power Automate

Array processing time problem

Problem: Using an “Apply to Each” workflow causes Power Automate to process each record subsequentially, greatly affecting performance time.

Using an “Apply to Each” command results in the workflow having to go through each record sequentially (one after another) before beginning the next record. This causes poor performance and will make your flow run frustratingly slow.  The image shows this workflow “Apply to each” action took 4 minutes to only complete 500 records. 

Array processing time problem

Problem scenario:

We have is a SharePoint list which contains random answers from a survey where users give answers between 1-10. We want to capture the 500 latest submissions and put it in an array so that we can use in our Power Automate flow. We are looking to obtain the following fields question ID, the rating and who submitted the answer. 

Problem scenario Power Automate processing time

Workflow step 1

We can create a workflow to do this very quickly by using the “Get Items” action which will get items in the SharePoint List. We will give it a top count of 500 items and order the list in descending order based off the ID. 

Tips and Tricks for Array Processing in Power Automate

Workflow step 2

We can then initilise a variable called “MyArray” and append the information we want from the value of the “Get Items” action.  

This is where array processing time becomes a problem

Tips for Array Processing in Power Automate

Solution to array processing time in Power Automate

Luckily, there is a little-known solution in Power Automate – Concurrency 

When running a “Apply to each” action you can go into settings and change the items concurrency. Concurrency refers to how many actions in the loop will run at once. By turning Concurrency on in the settings you can boost the “Degree of Parallelism” up to 50 times. This means instead of running actions sequentially, Power Automate will run 50 actions at one time! 

Power Automate array processing time solution


While this method can address many issues, it may not be suitable when the sequence of items is crucial for subsequent stages in your workflow, as it overlooks the order of the elements during row processing. Therefore, if maintaining the array’s order is essential for later processes, this approach will be ineffective. 

However, being able to run loops in batches can have a massive impact on flow run times and increase performance. Check out how much of an impact it will make to our example.  

To talk to one of our Power Automate experts, please get in touch.

Tricks for Array Processing in Power Automate solution

For more information from Microsoft on Power Automate – click here

Published On: March 26th, 2024 / Categories: Power Automate /