Hi,

Firstly, this repo is exactly what I was trying to solve! This is great work and I have a lot to learn from your implementation :))

I had been trying to accomplish this in OSD without forking the source, and ended up making a dirty version using deckGL's TileLayer instead. My implementation is similar, of maintaining handles to the dzi file and it's tile directory, and constructing a file handle to the requested png on demand.

Did you face any memory issues with creating several object URLs? If so, how did you tackle it?