2 Questions

[OS]

Question 1: How would I go about loading and displaying a large amount of graphics at once with little lag (I really don't care that much about this one right now)

Question 2: How do I wait for a certain amount of time before running code. I mean, read this:

if enemy_turn?
   enemy_turn_play1
   delay(2000) #inactive screen for two seconds
   enemy_turn_play2
   delay(2000) #inactive screen for two seconds
   enemy_turn_play3
   delay(2000) #inactive screen for two seconds
end

How would I create a delay method that makes the player wait for a few seconds? This one is really important! Thanks for any help. Peace!