Send keys work quickly when you send them to the foreground window. When you send them to a specific UI element, they will always take a while to find the specific element. The same applies to any UI automation actions.
Also, if it's the first action in your flow, usually some time passes before it compiles the flow and gets ready to run it.
Finally, I can see you have enabled verbose logging, which logs every single action with details in local logs. If you turn that off, it might run slower.
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