diff --git a/src/Chromosome.cpp b/src/Chromosome.cpp
index 531d0c3..59b3fde 100644
--- a/src/Chromosome.cpp
+++ b/src/Chromosome.cpp
@@ -23,6 +23,8 @@ float Chromosome::stddev_radius = .1;
 float Chromosome::stddev_color = 20;
 std::minstd_rand* Chromosome::re;
 
+sf::CircleShape Chromosome::circle;
+
 
 Chromosome::Chromosome()
 {
@@ -115,12 +117,13 @@ void Chromosome::draw(sf::RenderTarget& target, sf::RenderStates states) const
 	this->circle.setOrigin(Chromosome::size);
 	this->circle.setFillColor(sf::Color::White);
 	target.draw(this->circle, states);
+	
 	for (auto gene : this->genes) {
-		this->circle.setPosition(gene.position);
-		this->circle.setRadius(gene.radius);
-		this->circle.setOrigin(sf::Vector2f(gene.radius, gene.radius));
-		this->circle.setFillColor(gene.color);
-		target.draw(this->circle, states);
+		Chromosome::circle.setPosition(gene.position);
+		Chromosome::circle.setRadius(gene.radius);
+		Chromosome::circle.setOrigin(sf::Vector2f(gene.radius, gene.radius));
+		Chromosome::circle.setFillColor(gene.color);
+		target.draw(Chromosome::circle, states);
 	}
 }
 
diff --git a/src/Chromosome.hpp b/src/Chromosome.hpp
index b72ab57..2366eb3 100644
--- a/src/Chromosome.hpp
+++ b/src/Chromosome.hpp
@@ -27,6 +27,8 @@ public:
 	size_t length();
 	
 protected:
+	static sf::CircleShape circle;
+	
 	struct Gene
 	{
 		sf::Vector2f position;
@@ -34,6 +36,8 @@ protected:
 		sf::Color color;
 	};
 	
+	std::vector<Gene> genes;
+	
 	float maxRadius();
 	
 	Gene randomGene();
@@ -43,7 +47,4 @@ protected:
 	selectSegment(std::vector<Gene>& genes);
 	
 	std::vector<Gene>::iterator selectGene(std::vector<Gene>& genes);
-	
-	mutable sf::CircleShape circle;  // drawing the chromosome, one draw call at a time
-	std::vector<Gene> genes;
 };