@Ecom1212 

It is always like this when it comes to segments.. if you want to be more urgent than make the form subscribe to a specific list that would be the trigger for your flow. List subscription will happen immediately while segments are not updated immediately but need some time..

But then I run into the issue of my Welcome Flow only accepting one trigger (the currently segment that is super delayed)… Do I have to literally create a different flow only for this?

@Ecom1212 you could set a custom property that’s specific to your intended trigger segment as part of the button on your optin form, then use that property as a “flow filter” to narrow the recipients of your welcome series the same way that it would be targeted if the flow was triggered by your segment!