Insane memory usage when opening a downloaded pdf

So, I was opening a 1000 page pdf book on brave for reading. Brave was using over 3.5gb - 4gb ram while running the pdf. Is there any way to make brave take less memory while doing this particular tasks. Here are some screenshots.

here is my brave version :
Version 1.65.132 Chromium: 124.0.6367.202 (Official Build) (64-bit)