Delay as graphics assets become available

[mgrider]

As mentioned on the Swift forums a while back, it seems that image loading has a fair amount of delay on application start. I've only tested with a MacOS target so far, but there is a > 1 second delay before my Texture isReady properties are true.

For some context, I added this check in my render function:

        for entity in entities {
            guard let spriteComponent = entity.component(ofType: SpriteComponent.self),
                  spriteComponent.sprite()?.texture.isReady == true
            else { continue }
            canvas.insert(spriteComponent, at: entity.transform2.position)
        }

Admittedly, this delay is on fairly large ("full-screen" – i.e. background) textures. If I need to optimize (or show a loading state), I can certainly do that, but I thought I'd create an issue just in case this is still hanging around as a TODO somewhere.

[STREGA]

Yes, this is still an issue. Swift 6 changes will likely fix it but I am currently stuck on a strict concurrency issue with C interop. Resources do have a new immediate option when you construct them. `Texture(path, immediate: true)` this will cause a block instead of using the deferred cache loading. You could try that if these are non-optional resources.