Use less specific (i.e. faster) selectors.

services/web/public/stylesheets/app/editor/pdf.less

@@ -37,20 +37,6 @@
 			margin: 10px auto;
 			padding: 0 10px;
 			box-sizing: content-box;
-			// don't display the text layer by default,
-			// it slows down scrolling
-			div.plv-text-layer {
-				display: none;
-			}
-			// display it if we are hovering over the page
-			// so it's selectable
-			// FIXME: need to work out a solution to
-			// select text across multiple pages
-			&:hover {
-				div.plv-text-layer {
-					display: block;
-				}
-			}
 		}
 	}
 	.progress-thin {