Stephan Georg

What kind of issues?

Ok, that could indeed be an improvement. I thought for now caching should be done at the tiles server side, for example via CDN.

No, sorry. This is not possible right now.

Maybe can be realized with https://github.com/substack/node-heatmap ? Feel free to contribute.

I implemented it via [turf-arc](https://github.com/stepankuzmin/turf-arc#readme). But there are some bugs when crossing the dateline.

No, it's more a mathematical thing than a software bug. In the meantime you can calculate the geodesic path and add the coordinates as a polyline.

FYI @jbeuckm @OlivierKamers

Hey @swarnat Thank you for the PR, testing and sharing your experience with it. I haven't had time to test it yet, but I will do it asap and merge...

Maybe the automated cache cleanup should be optional. If you would have a huge cache it would've had bad impact to the map generation performance and running an external script...

After even more time (sorry for that), I reviewed your PR. First of all thanks for the implementation and testing. It is straightforward and effective improvement: **Benchmark** | Test |...