@amiloradovsky I am only curious. MuPDF is a small C codebase so it should be fast.
Sometimes I use https://f-droid.org/packages/com.commonsware.android.arXiv/ on my phone so I wanted to check how Acrobat behaves. On my Mali-400MP4 GPU AReader is the same thing as DV/muPDF so I do not miss anything.