Try this:
- Remove the Wait from the top
- After creating each object set their Visibility to false
- After that add a Wait of "Some fixed value" * (loopindex + 1)
- After the Wait action, set the Visibility to true
This should add a bunch of Wait actions each waiting more than the last. As the timers complete each instance will become visible, giving the illusion they are being created in a sequence instead of all at once.
You can later change how the instances become visible so it is more interesting than them just becoming visible immediately.