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This PR is a test using Gzip(+Base64) compression for the GeoJSON data in the visualizations.
Related to #1188
Advantages
It compresses the data to less than 10%. The compression time is a bit faster than pure-base64-encoding time. The decompression time is similar to pure-base64-decoding. It's a standard compression. It doesn't require extra Python dependencies. It does not require the JS Base64 dependency anymore.
Disadvantages
It requires an external JS dependency.