Project won't predict images

[ThaGuyWithCake]

For some reason whenever the character has dialogue the game lags. If It's just text dialogue with no name, there's no lag. So I used the F4 feature to detect what's being predicted and.. It's not predicting the gui namebox or other arbitrary images.

Yet based on documentation this syntax should work:

label start:
$ renpy.start_predict("gui/namebox *")

Any ideas why it's ignoring the predict?
I've tried this with other images as well, but they all ignore start_predict

[Imperf3kt]

You shouldn't need to manually predict those images,.
What happens if you try to show the images, without forcing a predict?

[ThaGuyWithCake]

If I try normally, it just fails to predict, yet shows the images anyway.
As I said, the game lags only whenever character dialogue occurs, so I'm not sure if there's a common underlying issue or not.