docs: Update USER_GUIDE.md (#808)

Added info about optimizing EPUB.

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? no
This commit is contained in:
Jonas Diemer
2026-02-10 12:04:32 +01:00
committed by GitHub
parent 98e6789626
commit 3a12ca2725

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@@ -230,6 +230,7 @@ Accessible by pressing **Confirm** while inside a book.
Please note that this firmware is currently in active development. The following features are **not yet supported** but are planned for future updates:
* **Images:** Embedded images in e-books will not render.
* **Cover Images:** Large cover images embedded into EPUB require several seconds (~10s for ~2000 pixel tall image) to convert for sleep screen and home screen thumbnail. Consider optimizing the EPUB with e.g. https://github.com/bigbag/epub-to-xtc-converter to speed this up.
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