Just remember that 30 MPH speed is a safety feature, and plenty fast.
If you turn GPS off and want to fly at MAX Speed, you are flying SOLEY LINE OF SIGHT, and if you go max Speed, your drone can get out of SIGHT in a hurry.
There have been reported speeds of 50 MPH, and I saw one of 60 MPH with a tail wind.
That gets out of sight on you, and you have GPS off, you don't know where Longitude and Latitude is for your drone, and neither does your drone know where it is.
Not only that, I have never done this, and never feel the need to, so I do not know if you can recall your DRONE with The HOME button with GPS off if you lose sight of it.
Losing sight of your Drone is a scary experience too, and can cause you to panic.
So know how to use The Green Arrow to get it back to you without being able to see it. Make sure you have plenty of elevation too.
I lost sight of mine the other day. It was rather high and I was flying over a park and a tree blocked my view.
I panicked a bit, forgot about the Green Arrow, and increased elevation and still could not see it. That's because it was just a dot in the sky and about 390 feet in the air.
So I thought I hit the Home Key, but I actually flipped OBS on instead.
Then I saw what I did, hit The Home Button and it came right back to me.
This happened in a matter of seconds but seemed like an eternity.
First thing I did right was take my hands off the stick and try to visually locate it again, and then think.
I looked and saw that I flipped the wrong switch and just hit home, and as it was coming home, I said to myself, "DUMMY" you Panicked, and all you needed to do was to look at your screen and use the Green Arrow to manually fly it back to you."
I practice as much as I can. But imo, until you get like about 20-30 flights and repeatedly use all of it's features and buttons like the back of your hand don't be turning stuff off that is there to help you enjoy your drone safely and to make sure you don't lose it.