It's not too slow really, and it's especially helpful if you're a beginner with soldering. One quick dab could save you from a bad joint, and you'll see that solder flow like water :) Better for a beginner to spend some extra seconds dabbing than troubleshooting. To the contrary, I use flux more with point-to-point than a PCB, the flux in core is adequate for the boards 99% of time. You have a lot of surface area for the flux to cover with those terminals though.
2/24/14 at 8:01pm