Why is texting slower than snap insta kik etc

I've found time and time again when trying to text or send pictures sending it through text is significantly slower than almost every other messenger app. Facebook, insta, snap, kik all of them are leagues faster at sending pictures than the basic text feature on my iphone. Why is this? I don't keep old conversations long. Yet it takes almost 5 mins to send a pic of a screenshot on text and it takes 5 seconds on anything else.

All of those apps use internet connection to send and receive messages which is usually very fast.

By comparison, text and video messages sent through the messaging app are sent through the phone lines and are subject to provider slowness, phone traffic, old infrastructure etc.

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