ralentizó

v. slow down

= slow down, slow up, weigh down.
Ex: However, the flight from DC appears to have slowed down more quickly than was anticipated, and we no longer read of large numbers of libraries making the change.
Ex: Since cataloging is the most time consuming part of digitization, it has slowed up the placement of files.
Ex: The passages describing the environment, though lushly written, are inclined to weigh down the narrative thrust of the novel.