Bookmarking some pdf is very slow

I found the bookmarking action for some pdf in Sony T1 is very slow. It could take about 30 seconds before the bookmark triangle appears. With epub book it only take about 2 seconds.
Press back to return to booklist then open the book again may make it looks more responsive.
The pdf I was reading is a text based pdf with some chinese fonts embeded, no cropped view, just in regular view.

Hello,
Thank you for your post.
PDF files have everything embedded, such as the Text font, pictures, and file structure therefore it takes longer to read the file prior to marking it. this is why you can read a PDF with Chinese fonts, but cannot read an Epub Book with Chinese characters.

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