The android app MobileSheets (designed for sheet music) will load a PDF into memory so tapping for the next page is quite quick. It also has an option to turn the pages of the PDF into separate image files for fast loading if necessary. It works well for iReal b charts - although no transposing
iReal b v1.5 update has landscape viewing implemented. This gives me the idea you might be able to export two iReal charts to computer, use Photoshop (or similar) to create one landscape page with the two pages side-by-side, then view in landscape in your PDF app.
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