My frame is blurry when exported as pdf

I have made my design portfolio on Figma in a single LONG frame. Its dimensions are 1920x65273. I wanted to keep it in a single frame because it is similar to how a website landing page would be. I exported the frame as a pdf. It was about 300mb so I compressed it down to 25mb. It looks great when I view it on my laptop. Everything is loading perfectly.

However, whenever I view the pdf on mine or someone else’s phone, it is blurry. The blur disappears after a few seconds but then when I scroll down and go back up, it becomes blurry again.

Is it happening because there is too much information on a single page of pdf? Can someone suggest to me any ways of fixing this? I would prefer not to split it into multiple frames…

I have the same problem, it seems to happen when the exported frame’s proportions are ellongated…
I didn’t find any other solution than copy the frame and split it into multiple frames before every export, then merge the pdfs back together.