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Scroll zoom on the demo image is very choppy for me. Not sure if it's my screen or the library itself.

Agreed. I'm using the latest version of Firefox.

Which OS? There is an issue open for Firefox on iOS: https://github.com/team-video/tragopan/issues/3. Is yours different?

Firefox on Linux.

What browser/os was giving you trouble?

Firefox on Linux

Thank you.