[AlotOfReading]

Depends on what your code does. A lot of my code runs robots. You can't scale horizontally because you can only fit so many systems in a room before you run afoul of production limits, safety requirements or cooling capacity. You can't scale vertically because zoning. You can't run the tests faster because physics.

So, you either run the expensive tests asynchronously and all that entails or you allow CI to take forever.

[withinboredom]

In that case, would it make more sense to have a small PR that you start with, get it reviewed, then open smaller PRs to your original PR? That way your approach/code can be reviewed while in your larger PR you tweak and fix tests.

[AlotOfReading]

Not as a (good) general solution. Some things are just hard to break down into smaller logical units. E.g. a complicated new driver might introduce thousands of lines of changes. Half a driver usually won't compile, but you could break things down into PRs over individual functions (in call order so there aren't compiler warnings). That's a wildly unnecessary amount of effort though. You could write a skeleton driver first too, but that's rote declarations barely worth reviewing even as part of a larger PR.