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## Summary * During chapter parsing, every <img> tag triggered ZIP decompression and an SD card write regardless of whether the image format was supported. The mandatory delay(50) after each SD write compounded the cost. A chapter with 6 GIF images (a common decorative element in older EPUBs) wasted ~750 ms before any text rendering began. * **What changes are included?** Added an ``ImageDecoderFactory::isFormatSupported()`` check before any file I/O in the img-handler. Only JPEG and PNG proceed to extraction; all other formats (GIF, SVG, WebP, etc.) fall through immediately to alt-text rendering with no SD card access. ## Additional Context Measured impact on a representative chapter with 6 GIF decorations: | | Before | After| |-- | -- | --| |Total parse time | ~882 ms | ~207 ms| |Image handling | ~750 ms | ~76 ms| --- ### 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**_
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