diff --git a/src/Chromosome.cpp b/src/Chromosome.cpp
index 9027ff9..4d6648a 100644
--- a/src/Chromosome.cpp
+++ b/src/Chromosome.cpp
@@ -49,6 +49,8 @@ Chromosome::Chromosome(const Chromosome& other)
 {
 	// reserve to other's size/capacity?
 	
+	this->genes.reserve(other.genes.size());
+	
 	for (auto& ptr : other.genes) {
 		this->genes.push_back(std::unique_ptr<Gene>(Gene::copy(ptr.get())));
 	}
@@ -60,6 +62,7 @@ Chromosome& Chromosome::operator=(const Chromosome& other)
 	// reserve to other's size/capacity?
 	
 	this->genes.clear();
+	this->genes.reserve(other.genes.size());
 	
 	if (this != &other) {
 		for (auto& ptr : other.genes) {
diff --git a/src/Chromosome.cpp.old b/src/Chromosome.cpp.old
deleted file mode 100644
index 59b3fde..0000000
--- a/src/Chromosome.cpp.old
+++ /dev/null
@@ -1,232 +0,0 @@
-#include "Chromosome.hpp"
-
-#include <algorithm>
-#if __GNUC__ < 7 // gcc 7 will support clamp
-namespace std {
-	template<typename T>
-	T clamp(T v, T lo, T hi)
-	{
-		return std::min(hi, std::max(lo, v));
-	}
-}
-#endif
-
-#include <iostream>
-#include <iterator>
-
-
-
-// #include <cmath>
-sf::Vector2f Chromosome::size(0, 0);
-float Chromosome::stddev_position = .1;
-float Chromosome::stddev_radius = .1;
-float Chromosome::stddev_color = 20;
-std::minstd_rand* Chromosome::re;
-
-sf::CircleShape Chromosome::circle;
-
-
-Chromosome::Chromosome()
-{
-	// this->genes is already empty
-	this->circle.setPointCount(36);
-}
-
-
-Chromosome::Chromosome(Chromosome& father, Chromosome& mother) :
-	Chromosome()
-{
-	std::uniform_int_distribution<> booldist(0, 1);
-	
-// 	auto fpair = this->selectSegment(father.genes);
-// 	auto mpair = this->selectSegment(mother.genes);
-	
-// 	auto cur_it = this->genes.begin();
-// 	std::cout << std::distance(cur_it, father.genes.begin()) << std::endl;
-// 	std::cout << std::distance(cur_it, mother.genes.begin()) << std::endl;
-// 	cur_it = this->genes.insert(cur_it, fpair.second, father.genes.end());
-// 	cur_it = this->genes.insert(cur_it, mpair.first, mpair.second);
-// 	cur_it = this->genes.insert(cur_it, father.genes.begin(), fpair.first);
-	
-// 	if (booldist(*Chromosome::re)) {
-// 		this->genes.insert(this->genes.begin(), fpair.second, father.genes.end());
-// 		this->genes.insert(this->genes.begin(), mpair.first, mpair.second);
-// 		this->genes.insert(this->genes.begin(), father.genes.begin(), fpair.first);
-// 	} else {
-// 		this->genes.insert(this->genes.begin(), mpair.second, mother.genes.end());
-// 		this->genes.insert(this->genes.begin(), fpair.first, fpair.second);
-// 		this->genes.insert(this->genes.begin(), mother.genes.begin(), mpair.first);
-// 	}
-	
-	auto gene_father = this->selectGene(father.genes);
-	auto gene_mother = this->selectGene(mother.genes);
-	
-	if (booldist(*Chromosome::re)) {
-		this->genes.insert(this->genes.begin(), father.genes.begin(), gene_father);
-		this->genes.insert(this->genes.begin(), gene_mother, mother.genes.end());
-	} else {
-		this->genes.insert(this->genes.begin(), mother.genes.begin(), gene_mother);
-		this->genes.insert(this->genes.begin(), gene_father, father.genes.end());
-	}
-}
-
-
-void Chromosome::mutate()
-{
-	std::uniform_int_distribution<> mutatedist(0, 1);  // 1/2 of the time, it mutates everytime!
-	std::uniform_int_distribution<> choicedist(0, 12);
-	while (mutatedist(*Chromosome::re)) {
-		int choice = choicedist(*Chromosome::re);
-		
-		if (choice < 1) {  // add
-// 			std::cout << "Added circle" << std::endl;
-			this->genes.push_back(this->randomGene());
-		
-		} else if (choice < 2) {  // remove
-// 			std::cout << "Removed circle" << std::endl;
-			auto it = this->selectGene(this->genes);
-			if (it != this->genes.end()) {
-				this->genes.erase(it);
-			}
-		
-		} else if (choice < 4) {  // swap
-// 			std::cout << "Swapped circles" << std::endl;
-			auto it_one = this->selectGene(this->genes);
-			auto it_two = this->selectGene(this->genes);
-			if (it_one != this->genes.end() && it_two != this->genes.end() && it_one != it_two) {
-				auto tmp = *it_one;
-				*it_one = *it_two;
-				*it_two = tmp;
-			}
-		
-		} else {  // mutate
-// 			std::cout << "Mutated circle" << std::endl;
-			auto it = this->selectGene(this->genes);
-			if (it != this->genes.end()) {
-				this->mutateGene(*it);
-			}
-		}
-	}
-}
-
-
-void Chromosome::draw(sf::RenderTarget& target, sf::RenderStates states) const
-{
-	this->circle.setPosition(0, 0);
-	this->circle.setRadius(Chromosome::size.x + Chromosome::size.y);
-	this->circle.setOrigin(Chromosome::size);
-	this->circle.setFillColor(sf::Color::White);
-	target.draw(this->circle, states);
-	
-	for (auto gene : this->genes) {
-		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);
-	}
-}
-
-
-size_t Chromosome::length()
-{
-	return this->genes.size();
-}
-
-
-float Chromosome::maxRadius()
-{
-	return std::min(Chromosome::size.x, Chromosome::size.y)/2;
-}
-
-
-Chromosome::Gene Chromosome::randomGene()
-{
-	float max_radius = this->maxRadius();
-	std::uniform_real_distribution<> xdist(0, Chromosome::size.x);
-	std::uniform_real_distribution<> ydist(0, Chromosome::size.y);
-	std::uniform_real_distribution<> rdist(0, sqrt(max_radius));
-	std::uniform_int_distribution<> colordist(0, 255);
-	
-	sf::Vector2f position(xdist(*Chromosome::re), ydist(*Chromosome::re));
-	float radius = (pow(rdist(*Chromosome::re), 2));
-	sf::Color color(
-		colordist(*Chromosome::re),
-		colordist(*Chromosome::re),
-		colordist(*Chromosome::re),
-		150
-	);
-	
-	Chromosome::Gene gene;
-	gene.position = position;
-	gene.radius = radius;
-	gene.color = color;
-	
-	return gene;
-}
-
-
-void Chromosome::mutateGene(Gene& gene)
-{
-	std::uniform_int_distribution<> booldist(0, 1);
-	float max_radius = this->maxRadius();
-	
-	if (booldist(*Chromosome::re)) {  // position
-		std::normal_distribution<> posdist(0, Chromosome::stddev_position);
-		gene.position.x = std::clamp<float>(
-			gene.position.x + posdist(*Chromosome::re)*max_radius,
-			0,
-			Chromosome::size.x
-		);
-		gene.position.y = std::clamp<float>(
-			gene.position.y + posdist(*Chromosome::re)*max_radius,
-			0,
-			Chromosome::size.y
-		);
-	}
-	
-	if (booldist(*Chromosome::re)) {  // radius
-		std::normal_distribution<> raddist(0, Chromosome::stddev_radius);
-		gene.radius = std::clamp<float>(
-			gene.radius + pow(raddist(*Chromosome::re)*sqrt(max_radius), 2),
-			0,
-			max_radius
-		);
-	}
-	
-	if (booldist(*Chromosome::re)) {  // color (all three values at the same time)
-		std::normal_distribution<> coldist(0, Chromosome::stddev_color);
-		gene.color.r = std::clamp<unsigned int>(gene.color.r + coldist(*Chromosome::re), 0, 255);
-		gene.color.g = std::clamp<unsigned int>(gene.color.g + coldist(*Chromosome::re), 0, 255);
-		gene.color.b = std::clamp<unsigned int>(gene.color.b + coldist(*Chromosome::re), 0, 255);
-		gene.color.a = std::clamp<unsigned int>(gene.color.a + coldist(*Chromosome::re), 0, 255);
-	}
-}
-
-
-std::pair<std::vector<Chromosome::Gene>::iterator, std::vector<Chromosome::Gene>::iterator>
-Chromosome::selectSegment(std::vector<Chromosome::Gene>& genes)
-{
-	std::uniform_int_distribution<> randdist(0, genes.size()-1);
-	auto first = genes.begin() + randdist(*Chromosome::re);
-	auto second = genes.begin() + randdist(*Chromosome::re);
-	
-	if (first > second) {
-		std::swap(first, second);
-	}
-	
-	return std::pair<std::vector<Chromosome::Gene>::iterator,
-	                 std::vector<Chromosome::Gene>::iterator>(first, second);
-}
-
-
-std::vector<Chromosome::Gene>::iterator
-Chromosome::selectGene(std::vector<Chromosome::Gene>& genes)
-{
-	if (genes.empty()) {
-		return genes.end();
-	} else {
-		std::uniform_int_distribution<> posdist(0, genes.size()-1);
-		return genes.begin() + posdist(*Chromosome::re);
-	}
-}
diff --git a/src/Chromosome.hpp.old b/src/Chromosome.hpp.old
deleted file mode 100644
index 2366eb3..0000000
--- a/src/Chromosome.hpp.old
+++ /dev/null
@@ -1,50 +0,0 @@
-#pragma once
-
-#include <random>
-#include <utility>
-#include <vector>
-#include <SFML/Graphics.hpp>
-#include <SFML/System.hpp>
-
-
-
-class Chromosome : public sf::Drawable
-{
-public:
-	static sf::Vector2f size;
-	static float stddev_position;  // percent of max_radius
-	static float stddev_radius;    // percent of max_radius
-	static float stddev_color;
-	static std::minstd_rand* re;
-	
-	Chromosome();  // create empty chromosome
-	Chromosome(Chromosome& father, Chromosome& mother);  // crossover
-	
-	void mutate();  // randomly mutate chromosome's genes
-	
-	virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const;
-	
-	size_t length();
-	
-protected:
-	static sf::CircleShape circle;
-	
-	struct Gene
-	{
-		sf::Vector2f position;
-		float radius;
-		sf::Color color;
-	};
-	
-	std::vector<Gene> genes;
-	
-	float maxRadius();
-	
-	Gene randomGene();
-	void mutateGene(Gene& gene);
-	
-	std::pair<std::vector<Gene>::iterator, std::vector<Gene>::iterator>
-	selectSegment(std::vector<Gene>& genes);
-	
-	std::vector<Gene>::iterator selectGene(std::vector<Gene>& genes);
-};