In addition to what the other user said, most changes are also small. Google's infra and culture encourages changes that are the size of a commit, not a pull re

In addition to what the other user said, most changes are also small. Google's infra and culture encourages changes that are the size of a commit, not a pull request. This depends on the particular language and context, but simple, isolated, and usually small changes are preferred and encouraged. This allows relatively quick review for lots of things. If I see a change that modifies a single function and adds a test to validate the change in functionality, that's very quick to review.