Runs fine on my low powered Dockstar NAS with only 128MB of memory running Debian.
One thing that would be good is an option to not display book images in lists, or cache the images somehow after the resizing; resizing is the biggest performance issue on my small NAS.
Also I noticed that the Tags and Series pages dont respect the cops_max_item_per_page setting. With over 9000 tags this caused JFBReader to crash on my phone.
But a great app, means I can stop running calibre2opds.