AMR does not scale with lots of manga
With ~200 manga, approx. 50 of which have unread chapters, AMR is slow to respond to a lot of actions (filtering, etc...)
Maybe populate the list lazily instead of always creating all items ? My own outdated addon, though far less powerful, was snappy even with that number of mangas (and it contacted each manga's last page on popup to check for updates, even if it didn't fetch the total number of chapters).
I'm positive there should be a way to make AMR more efficient.
I attach a big list of mangas, which are all currently valid, as exported by AMR without reading information, to show that it slows down a lot even after the initial import, when no updates or http(s) requests should be necessary. Most notable is when I try to change the category-based filtering, which makes AMR (and Firefox) crawl to a halt for several seconds.
Attached export: AMR_example.json