IMHO, absolutely. The intensity comes from paying very close attention to getting the form and technique right before we get sloppy from too much momentum.
To go fast, first go slow and get it right.
My sentiments exactly. Slowness develops good kihon and then speed can be added later. The faster things go the more the technique breaks down in quality. I have my students practice pacing-slow a fast attack down to control it rather than react at the same speed.