Reduce the number of fonts used: Japanese fonts, in particular, take up a lot of space and their mere presence in the list can affect performance.

Reduce the number and size of images on the screen at a time: Images are loaded when they scroll and enter the screen, so placing them outside the initial screen will speed up the display.

Reduce the absolute number of boxes per page: it works better if you break up the pages, rather than cramming too much into one page.