mediocre movies start to drag as soon as the action speeds up 
(ROOT (S (NP (JJ mediocre) (NNS movies)) (VP (VBP start) (S (VP (TO to) (VP (VB drag)))) (ADVP (ADVP (RB as) (RB soon)) (SBAR (IN as) (S (NP (DT the) (NN action)) (VP (VBZ speeds) (PRT (RP up)))))))))
(ROOT (S (NP (JJ ) (NNS )) (VP (VBP ) (S (VP (TO ) (VP (VB )))) (ADVP (ADVP (RB ) (RB )) (SBAR (IN ) (S (NP (DT ) (NN )) (VP (VBZ ) (PRT (RP )))))))))