If I’m understanding the OP’s problem correctly, then this is how I get around it (on the web - don’t know about apps):
Method 1 (recommended)
When changing the taxon name, DO NOT delete it! Click and drag to select all of it and then start typing the new taxon name. This stops the api from loading all obs.
Method 2
If you backspace to delete the current taxon name, DO NOT delete the first letter, then type in new taxon name and go back and delete first letter if it’s not part of the new name (i.e. easier to use Method 1 ;-).