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Pro Low on resources
Pro Reloads on changes instantly
Pro Outline, properties and thumbnail panes
Pro Open multiple pdfs in tabs
qpdfview is a tabbed document viewer.
Pro Allows for some scripting
Opens files in named instances, open files on designated page.
Calling of userscripts on a document is thus far not possible.
Pro Fast search in all opened files
Pro Dark mode
However only inverted colors.
Pro Scale, rotate and fit
Pro Supports TOC-sidebar
Pro Switch tabs with keyboard shortcuts
Pro Continuous and multiple-page layouts
Pro Add highlights and text annotations
Pro DjVu support
Pro Fullscreen and presentation views
Pro PostScript support
Pro Custom background colors
It is available on any major computer OS.
Pro Deactivation of GUI elements
Pro Supports thumbnail preview
Pro Input forms are editable
Con Deadly slow on complex pdf files
Con File information missing page size
Con No multiple mapping of commands
Having two key mappings to execute the moveUp command doesn't seem to be possible.
Con Configuration intended via GUI
There is no explicit documentation of configuration parameters used in qpdfview.conf and shortcuts.conf (those are the most important ones). However the files are editable conveniently, which is of value.