We have a slack channel for dev and people issue review requests in it. This works best when most people can review the code obviously. There's also an informal culture of trading (you promptly review my branch; I'll promptly review yours.)
We cut some corners and assume devs are ok to address minor complaints w/o further review. So you see "approved pending minor issues X, Y" which doesn't require further review.
We do something akin to pair programming for reviews, though we don't pair program at all. If you can, you sit with the reviewer and discuss. This often leads to a joint effort to fix anything the review brings up and speeds turnaround.
Finally, it helps if you get serious about a linter and, as much as possible, software enforced code style.
We cut some corners and assume devs are ok to address minor complaints w/o further review. So you see "approved pending minor issues X, Y" which doesn't require further review.
We do something akin to pair programming for reviews, though we don't pair program at all. If you can, you sit with the reviewer and discuss. This often leads to a joint effort to fix anything the review brings up and speeds turnaround.
Finally, it helps if you get serious about a linter and, as much as possible, software enforced code style.