imap_unordered uses way less memory on long iterations
imap_unordered uses way less memory on long iterations

remagio/twarc,edsu/twarc,ericscartier/twarc,hugovk/twarc,kevinbgunn/twarc,ericscartier/twarc,miku/twarc,miku/twarc,kevinbgunn/twarc,DocNow/twarc,remagio/twarc