Describe the Bug with repro steps
- Go to V3 designer.
- Create a flow with a manual trigger, compose action, and an apply-to-each block.
- Save the flow.
- Run the flow with apply-to-each having a concurrency value significantly above 1 (e.g. 5-10). Note the runtime.
- Run the flow again with apply-to-each having a concurrency control value set to off (like in the image below). Note how the runtime is significantly longer than the runtime of the flow in step 4 with the concurrency value between 5-10.

What type of Logic App Is this happening in?
Power Automate
Are you using new designer or old designer
New Designer
Did you refer to the TSG before filing this issue? https://aka.ms/lauxtsg
Yes
Workflow JSON
No response
Screenshots or Videos
No response
Browser
All -> no difference between browsers found.
Additional context
No response