> Don't you get dinged as a slow performer?

No because the document is not the work. Management wants someone to figure out the solution to their problems. The document is just a step in solutioning.

Without the doc, others would have to re-do all that work if you get hit by a bus. Or you’d be stuck in endless meetings conveying the vision instead of figuring out the next problem.

Document length is inversely proportional to the quality of your thinking/insight. When you create fluff, everyone can see you didn’t do the work.

It's going to depend on the type of team and environment you work in. Probably on how senior you are as well.

If your boss asks you for specific documents and expects a quick turnaround, and you regularly take 3 weeks or whatever to produce them, then yeah probably.

If your boss generally leaves you alone to find and solve problems on your own, then probably not.