Well, I think I’ve answered my own question, at least generally. 24,049 Pins is over the limit. At least, if they are all Visible/not Hidden. At least, on my iPad 2. Perhaps a more modern device with better CPU and more memory would be OK with that number of Pins showing.
When I have all my silly obsessive prehistoric sites Pins showing, and try to View any Favorite, the map zooms to the view, my Favorites icons show, the base map is blanked out/doesn’t get rendered, and PE Pro 2.4 crashes.
I think PE works OK when I have my massive Pin Groups Hidden (leaving the smaller, more reasonably sized Groups visible) but then the Hidden Pins are still selectable, which is a bit confusing.
In the end, until I can afford a new iPad, I’ll just have to remove some of these huge multi-thousand-Pin Groups and re-import them when I actually need them for traveling. It’s been an interesting experiment! And, now I have the CSVs all cleaned up, available for when they are actually going to be relevant. Neato!
There is no technical limit to the number of pins or favorites, however, very large numbers can degrade performance significantly especially on older devices (like iPad 2). Hiding the individually or via groups using the hidden flag can alleviate much of the slowdown you will notice when using the map, however, saving or making any changes to or deleting saved favorites content can cause the app the freeze momentarily.
We do not recommend having over 5,000 favorites, but are working to improve this.