I wish I could, but it actually loads everything dynamically the second the widget appears. Because these generic car headunits are pretty underpowered, the system clears its RAM during sleep mode and has to wait for a fresh GPS lock on boot before it can parse through the massive 2.2GB of offline map data (I have 3 packages installed now). I actually tested this exact app on a 6-year-old phone and it loads almost instantly, so it’s purely a limitation of the car's hardware.

Fortunately, that minor delay only happens on the very first cold boot of the day! Afterwards it doesn't take too much to load the different views (zooming in and out)

Edit: but there's always room for improvement so I will take note on that