This seems more efficient, but I've run into a few issues when I've tried it. It's harder to clip the leads when there are so many of them sticking up. Populating the board component by component gives you more focus on that component, meaning if you made a mistake you're more likely to catch it. Soldering it all in one go, at least for me, tends to lead to poorer joints, largely because I try to do more joints in between wiping the iron on the sponge.
Plus, populating the board is the fun part. I'd rather find a way to speed up the other stuff.
Plus, populating the board is the fun part. I'd rather find a way to speed up the other stuff.