`$('#slideshow').find('.previous, .next, .play, .pause').hide()` is faster because it's mapped to native code(for the first element selection) - and is better readable.

http://24ways.org/2011/your-jquery-now-with-less-suck/
http://stackoverflow.com/questions/12674591/inefficient-jquery-usage-warnings-in-phpstorm-ide/16620060#16620060