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> Unfortunately, the demo is slow because I'm hosting it on Cloudflare R2 which has no outgoing bandwidth fees.

Can you expand on this a little? Cloudflare is supposed to be pretty competent as CDN and with caching.

This is Cloudflare's new blob storage product R2. Putting the free Cloudflare CDN and cache infront of R2 doesn't work with HTTP Range headers, likely for product differentiation from their Video CDN. The latency of R2 is also much higher than S3 or GCP, but I know the R2 team is working hard on improving this.

FWIW you can add your own caching logic with Workers, if the CDN for some reason doesn't do Range. The Cache API exposed to Workers is quite useful.

That is exactly how the open source Workers integration works:

https://protomaps.com/docs/cdn/cloudflare

However, it is an optional acceleration layer on top of the PMTiles access pattern; and it doesn't make a compelling demo, it's just a Z/X/Y layer which is how map tiles have worked for the past 20 years.

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