Greetings,
I've been developing a Subscription UI extension for my app. The development is mostly fine, with a few issues with backwards-compatibility requiring the dependencies in my package.json to be frequently updated, but keeping things up to date solves most issues during development.
There is one issue that is nagging me, however, and has been for the past few weeks; namely that the timeout for loading the subscription UI extension from the developer's machine (using ngrok or others, I personally use localtunnel with the --tunnel-url option) is too small. I'm often developing software outside of the house where I don't have access to 100mbit connections and can only rely on my phone's data, and as such loading 750kb of data over a public tunnelling service can take a few seconds. But shopify seems to be just giving up after 5 seconds, even though eventually the code reaches the Shopify admin (but is not rendered).
As a fix, I'd like to propose that if the development console is open, the timeout for loading should be bumped to a more sensible default for development, like 30 seconds.
As a reference, here is a video of what is happening, visually. After the "There's a problem loading this app" page shows, the code loads, too: the fact that the "Cancel" button shows at the bottom is proof of that (as it is set by my app).
