I suffer horrible download speed. It's brutal. The good stuff is just so expensive here, it's either Bell high speed internet, or groceries, and I wisely choose the latter. I've been missing out on decent photogrammetry since this sim launched, really. That constant, "Your bandwidth is to low..." pop-up, very annoying! Who would even want to turn off their photogrammetry anyway!?? Not good.. So I looked into this. How does this cache thing work I wondered. I came across a video, which improved my sim experience. I didn't know there was a file missing. If anybody is in the same predicament as me, (horrible buildings with settings on Ultra) I recommend watching this, and make a manual cache file.
I've outlined favorite regions I like to fly, manually cached those areas, finally I get decent photogrammetry! I'm loving 3500ft in my DH Tiger Moth! A proverbial "game changer" for me. Just passing this along, I found the video very helpful.

https://www.youtube.com/watch?v=N9eDo8nB6js

Doug