Optimize preloading of thumbnail image rows, loading visible rows immediately
Optimize preloading of thumbnail image rows, loading visible rows immediately

gootdude/bookreader,Islandora/internet_archive_bookreader,niksu/bookreader,brisandbeans/bookreader,gootdude/bookreader,Islandora/internet_archive_bookreader,niksu/bookreader,openlibrary/bookreader,garyrh/bookreader,yankl/bookreader,niksu/bookreader,yankl/bookreader,garyrh/bookreader,Islandora/internet_archive_bookreader,nikolas/bookreader,gootdude/bookreader,nikolas/bookreader,brisandbeans/bookreader,niksu/bookreader,brisandbeans/bookreader,Islandora/internet_archive_bookreader,openlibrary/bookreader,internetarchive/bookreader,niksu/bookreader,Islandora/internet_archive_bookreader,internetarchive/bookreader,yankl/bookreader,yankl/bookreader,brisandbeans/bookreader,yankl/bookreader,garyrh/bookreader,gootdude/bookreader,brisandbeans/bookreader,garyrh/bookreader,openlibrary/bookreader,openlibrary/bookreader,garyrh/bookreader,openlibrary/bookreader