If you start to understand the so-called 'optimum' speeds and feeds, take a note that they are designed for a commercial shop to strike the balance between money spent, and money earned, not about making the best possible finishes, or the least risky set-ups.
Shapers in a Hobby environment, have no need to be run balls-to-the-wall, and in truth, trying to push the speeds and feed up to what is considered commercially viable, has long since proven to be a money-loser for most commercial shops. Which is to say, there is a reason they claim that you can make anything with a Shaper, except a living!
Slower cuts put less wear on the machinery and tooling (as cheap as it is, it's kinda nice to preserve it for use again later).
And, you don't have to ensure it is all bolted down to the Continental Shield in order to be sure it will still be sitting in the same corner of the shop when done...
If ya gots a Missus, ask her if slow, comfortable and smooth is alright, vs. trying to ride a jackhammer every time!
Seriously, slow is OK. I pretty much guarantee that you will spend more time obsessing over the set-up and planning, of the cut, than you will actually cutting. As much as I am a fan of time efficiency, this is not a place to rush things. Nor is it the tool that you would pick, if time, truly, was of the essence.