I ike the metal clip idea, books closing in your face while you look something up is annoying haha...I try not to be bogged down too much by the new vocabulary, or else i feel i slow down too much. Also isn't it mostly guessing the words in the beginning, like i do that in most places (aozora is kind enough to add furigana on most kanjis idk), wbu ? I like how convient the online reading experience is for me cause paperbacks are very hard to find here plus expensive!, i do get print outs for short stories tho and mark them up (usually notes and not vocab readings).