Why is the installation package of 划词翻译 so large, nearly 4 MB?

For the sake of convenience, 划词翻译 integrates two large features:

• Tesseract OCR: Used to convert images to text in the screenshot / image translation feature.
• PDF.js: Used to translate PDF files.

Without these two features, the size of 划词翻译 should be only a few hundred KB.