Hello.
So I'm not sure I know exactly what you're talking about, but I am guessing you are having trouble referencing the right... stuff.
Usually, using multiple objects is a bad idea, not just for lag but for a clean project. If I were you I would redo the sprites to be one object with - if they aren't animated - one animation and several frames. When you set the speed to 0, and reference the frame number, you'll always get the one you set up in the animations window.
Now on to the actual issue. If you have multiple objects, and don't like the idea of using the above method, you can combine them in a family with an instance variable you can identify each one by (don't use UID or count, they're unreliable). This way you can assign a different ID to each object in the editor. You can then do the same with the text boxes; [condition] > set text (array(ID), array(ID/something else))
Hope that helps. If it doesn't, a screenshot or something might help.