swift - Multiple circles drawn SpriteKit -

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i'm working on simple game based on paiting background player. in left , right corner there buttons move character left or right. i've implemented (character moving , lefts painted background behind), adding circles fps's drops fast. there solution that?

    import spritekit  class gamescene: skscene {     var playerdot:playerdot = playerdot(imagenamed:"player")     var isturningleft:bool = false     var isturningright:bool = false     var lastlocation:cgpoint = cgpoint()      override func didmovetoview(view: skview) {         /* setup scene here */         let mylabel = sklabelnode(fontnamed:"helvetica")         mylabel.name = "left"         mylabel.text = "left"         mylabel.fontsize = 30         mylabel.horizontalalignmentmode = .left         mylabel.position = cgpoint(x:cgrectgetminx(self.frame), y:cgrectgetminy(self.frame))         self.addchild(mylabel)          let mylabel2 = sklabelnode(fontnamed:"helvetica")         mylabel2.name = "right"         mylabel2.text = "right"         mylabel2.fontsize = 30         mylabel2.horizontalalignmentmode = .right         mylabel2.position = cgpoint(x:cgrectgetmaxx(self.frame), y:cgrectgetminy(self.frame))         self.addchild(mylabel2)          playerdot.position = cgpoint(x:cgrectgetmaxx(self.frame)/2, y:cgrectgetminy(self.frame))         self.addchild(playerdot)     }        override func touchesbegan(touches: set<uitouch>, withevent event: uievent?) {         touch in touches {             let location = touch.locationinnode(self)             if let thename = self.nodeatpoint(location).name {                 if thename == "left" {                    isturningleft = true                     isturningright = false                 }                 else if thename == "right" {                     isturningright = true                     isturningleft = false                 }             }         }     }      override func touchesended(touches: set<uitouch>, withevent event: uievent?) {         touch in touches {             let location = touch.locationinnode(self)             if let thename = self.nodeatpoint(location).name {                 if thename == "left" {                     isturningleft = false                 }                 else if thename == "right" {                     isturningright = false                 }             }         }     }      override func touchesmoved(touches: set<uitouch>, withevent event: uievent?) {         touch in touches {             let location = touch.locationinnode(self)             if let thename = self.nodeatpoint(location).name {                 if thename == "left" {                     isturningleft = false                 }                 else if thename == "right" {                     isturningright = false                 }             }         }     }       override func update(currenttime: cftimeinterval) {         if(isturningleft){             playerdot.increaseangle()         } else if (isturningright){            playerdot.decreaseangle()         }         //calculates new character position based on angle of movement changed         playerdot.updateposition()         drawcircle()     }      func drawcircle(){         if(distancefromcgpoints(lastlocation, b: playerdot.position)>2){         let circle = skshapenode(circleofradius: 10 )         circle.position = playerdot.position         circle.fillcolor = skcolor.orangecolor()         circle.strokecolor = skcolor.orangecolor()         self.addchild(circle)         lastlocation = playerdot.position         }     }      func distancefromcgpoints(a:cgpoint,b:cgpoint)->cgfloat{         return sqrt(pow(a.x-b.x,2)+pow(a.y-b.y,2));     }      func random() -> cgfloat {         return cgfloat(float(arc4random()) / 0xffffffff)     }      func random(min min: cgfloat, max: cgfloat) -> cgfloat {         return random() * (max - min) + min     } }

edit: drawcircle skshapenode replaced skspritenote

func drawcircle(){     if(distancefromcgpoints(lastlocation, b: playerdot.position)>2){     let playerdot2 = skspritenode(imagenamed:"player")     playerdot2.position = playerdot.position     self.addchild(playerdot2)     lastlocation = playerdot.position     } }

if having frame rate drops parts of code slowing down execution much. need optimise code. use instruments (time profiler) find out lines/functions causing problems speed wise. if have never used before read on , use couple times gist, recommend watching wwdc video profiling in-depth


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