PDF scrolling takes long to render new part. They are left blank and then updated.

Same issue. I hesitate while scrolling because I know I will be seeing half blank pages. 

Also, the text selection behavior in PDFs is not like in webpages. And I heard someone who wanted webpage text to be more like windows so this goes further back.

The fonts are faint and blurry, not crisp, sharp, dark like the original edge.