怎么提升游戏加载速度？

 1 local jhmjResList = {}
 2 jhmjResList[#jhmjResList + 1] = "animate/jhmj_cpgh.png"
 3 jhmjResList[#jhmjResList + 1] = "animate/game_flash_outcard_tips.png"
 4 jhmjResList[#jhmjResList + 1] = "game/yule/jhmj/res/game/sp_trusteeCover.png"
 5 jhmjResList[#jhmjResList + 1] = "game/yule/jhmj/res/game/sp_trusteeMan.png"
 6 jhmjResList[#jhmjResList + 1] = "gameScene.png"
 7 
 8 local function callBack(img)
 9     local temp1 = cc.Sprite:createWithTexture(img)
10     yl.cacheLayer:addChild(temp1)
11 end
12 
13 for i = 1, #jhmjResList do
14     if #(jhmjResList[i]) > 0 then
15         display.loadImage(jhmjResList[i], callBack)
16     end
17 end