See the chart at the beginning of the Lua filters documentation for one data point.

On May 30, 2023, at 3:46 PM, Oliver <news-WPTjrydoUPgeaOpM6FAJmQkbCANdLtlA@public.gmane.org> wrote:

Thanks for this, John.

Do you know, is the performance hit big? Or nothing really to worry?

Regards,
Olli

On 30 May 2023, at 4:18, John MacFarlane wrote:

Because JSON filters involve serializing the Haskell data structure to JSON, then decoding that back to a Haskell data structure, modifying it, encoding it to JSON, and decoding it back. The Lua interface avoids all of this serialization/deserialization.

On May 29, 2023, at 12:46 AM, oliver <news-WPTjrydoUPgeaOpM6FAJmQkbCANdLtlA@public.gmane.org> wrote:

Hi there

The doco says Lua filters “are usually faster than JSON filters” and from my understanding Haskell filters are JSON filters.

So why are filters in Pandoc’s “native” language slower than filters in Lua?

Thanks for clarification!
Olli

On 29 May 2023, at 11:03, Michael Milton wrote:

I just tried to render a PowerPoint presentation from markdown. However the template I used is a bit odd, and I noticed that my title slide was not populated with text, whereas the regular slides were. I wonder if someone could explain the logic that Pandoc uses to find a text box to insert text into? Is there a way to modify my template to avoid these issues? --
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