You're using it on low, that's why. There's a huge difference in performance from low to max effort.
Not sure why I was downvoted. But seems the downvoter is quick to downvote anything that doesn’t fit the narrative they’re looking for. I’m just reporting my findings.
But even in this very post, you can see that Max was actually cheaper than High.
If you are using API, you should be comparing based on end-to-end cost or speed or whatever blend of those two matches your cost/time budget.