diff --git a/factorio-blueprint-generator/factory_graph_inserter.yml b/factorio-blueprint-generator/factory_graph_inserter.yml
index 7e5e2cb..1d00af3 100644
--- a/factorio-blueprint-generator/factory_graph_inserter.yml
+++ b/factorio-blueprint-generator/factory_graph_inserter.yml
@@ -1,49 +1,58 @@
 subfactories:
   - !SubFactory
     recipe: iron-gear-wheel
-    machines: 2
+    machines: 6
     machine: assembly-machine-3
   - !SubFactory
     recipe: copper-cable
-    machines: 3
+    machines: 9
     machine: assembly-machine-3
   - !SubFactory
     recipe: electronic-circuit
-    machines: 2
+    machines: 6
     machine: assembly-machine-3
   - !SubFactory
     recipe: inserter
-    machines: 2
+    machines: 6
     machine: assembly-machine-3
   - !ExternalConnection
     inputs: 1
     outputs: 5
+  - !SideLoader
 factory_connections:
   - item: iron-gear-wheel
-    amount: 5
-    from: 0
-    to: 3
-  - item: copper-cable
     amount: 15
+    from: 0
+    to: 5
+  - item: copper-cable
+    amount: 45
     from: 1
     to: 2
-  - item: electronic-circuit
-    amount: 5
-    from: 2
-    to: 3
   - item: iron-plate
-    amount: 10
+    amount: 30
     from: 4
     to: 0
   - item: iron-plate
-    amount: 5
+    amount: 15
     from: 4
     to: 2
   - item: copper-plate
-    amount: 7.5
+    amount: 22.5
     from: 4
     to: 1
   - item: inserter
-    amount: 5
+    amount: 15
     from: 3
     to: 4
+  - item: iron-plate
+    amount: 15
+    from: 4
+    to: 5
+  - item: iron-plate;iron-gear-wheel
+    amount: 30
+    from: 5
+    to: 3
+  - item: electronic-circuit
+    amount: 15
+    from: 2
+    to: 3
diff --git a/factorio-blueprint-generator/src/assembly.rs b/factorio-blueprint-generator/src/assembly.rs
index ae7968e..2b1d440 100644
--- a/factorio-blueprint-generator/src/assembly.rs
+++ b/factorio-blueprint-generator/src/assembly.rs
@@ -415,7 +415,8 @@ pub fn assembly_line_2_input(
                 Direction::Right,
             ));
         }
-        if i < (3 * halve_machines - 1) {
+        if i < (3 * halve_machines - 2) || (halve_machines % 3 == 1 && i < (3 * halve_machines - 1))
+        {
             blueprint.add_entity(Entity::new_belt(
                 output_belt,
                 Position::new(1 + 2 * i as PositionType, 15),
diff --git a/factorio-blueprint-generator/src/bin/generate_factory.rs b/factorio-blueprint-generator/src/bin/generate_factory.rs
index 334fbd8..6200eee 100644
--- a/factorio-blueprint-generator/src/bin/generate_factory.rs
+++ b/factorio-blueprint-generator/src/bin/generate_factory.rs
@@ -29,16 +29,16 @@ fn main() {
     let l = ValidLayout {
         max_tries: 10,
         retries: 20,
-        start_size: Position::new(20, 20),
-        growth: Position::new(5, 5),
+        start_size: Position::new(48, 48),
+        growth: Position::new(0, 0),
     };
 
     let l = GeneticAlgorithm {
         mutation_retries: 20,
-        population_size: 10,
-        population_keep: 2,
+        population_size: 20,
+        population_keep: 1,
         population_new: 2,
-        generations: 20,
+        generations: 50,
         valid_layout: l,
     };
     let p = ConflictAvoidance {
diff --git a/factorio-blueprint-generator/src/factory.rs b/factorio-blueprint-generator/src/factory.rs
index 1e7c764..24138ed 100644
--- a/factorio-blueprint-generator/src/factory.rs
+++ b/factorio-blueprint-generator/src/factory.rs
@@ -1,4 +1,4 @@
-use factorio_blueprint::abstraction::Blueprint;
+use factorio_blueprint::abstraction::{Blueprint, Entity};
 use factorio_core::{beltoptions::Beltspeed, prelude::*};
 use factorio_layout::{Connection, Interface, LayoutInput, Layouter, MacroBlock};
 use factorio_pathfinding::Pathfinder;
@@ -25,6 +25,7 @@ pub enum Building {
         outputs: usize,
     },
     BeltPool,
+    SideLoader,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
@@ -46,7 +47,7 @@ pub fn generate_factory<L: Layouter, P: Pathfinder>(
     let mut connections = Vec::new();
     let mut used_connections = Vec::new();
 
-    for b in &factory_graph.subfactories {
+    for (i, b) in factory_graph.subfactories.iter().enumerate() {
         match b {
             Building::SubFactory {
                 recipe,
@@ -55,12 +56,22 @@ pub fn generate_factory<L: Layouter, P: Pathfinder>(
             } => {
                 assert!(machine == "assembly-machine-3");
 
+                let input_count = factory_graph
+                    .factory_connections
+                    .iter()
+                    .filter(|&c| c.to == i)
+                    .count();
+
                 let (b, size, y_output, y_inputs) = assembly_line_2_input(
                     *machines,
                     recipe,
-                    Beltspeed::Normal,
-                    Some(Beltspeed::Normal),
-                    Beltspeed::Normal,
+                    Beltspeed::Express,
+                    if input_count == 2 {
+                        Some(Beltspeed::Express)
+                    } else {
+                        None
+                    },
+                    Beltspeed::Express,
                 );
 
                 blueprints.push(b);
@@ -101,6 +112,34 @@ pub fn generate_factory<L: Layouter, P: Pathfinder>(
                 blueprints.push(Blueprint::new());
                 used_connections.push((0, 0));
             }
+            Building::SideLoader => {
+                let mut blueprint = Blueprint::new();
+                blueprint.add_entity(Entity::new_belt(
+                    Beltspeed::Fast,
+                    Position::new(1, 1),
+                    Direction::Up,
+                ));
+
+                blocks.push(MacroBlock {
+                    size: Position::new(1, 1),
+                    input: vec![
+                        Interface {
+                            offset: Position::new(0, 0),
+                            dir: Direction::Right,
+                        },
+                        Interface {
+                            offset: Position::new(0, 0),
+                            dir: Direction::Left,
+                        },
+                    ],
+                    output: vec![Interface {
+                        offset: Position::new(0, 0),
+                        dir: Direction::Up,
+                    }],
+                });
+                blueprints.push(blueprint);
+                used_connections.push((0, 0));
+            }
             Building::BeltPool => todo!(),
         }
     }
@@ -112,7 +151,7 @@ pub fn generate_factory<L: Layouter, P: Pathfinder>(
             endblock: c.to,
             endpoint: used_connections[c.to].1,
             lanes: 1,
-            beltspeed: Beltspeed::Normal,
+            beltspeed: Beltspeed::from_items_per_second(c.amount),
         });
 
         used_connections[c.from].0 += 1;
@@ -122,16 +161,11 @@ pub fn generate_factory<L: Layouter, P: Pathfinder>(
     // dbg!(&blocks);
     // dbg!(&connections);
 
-    let l = layouter
-        .layout(
-            &LayoutInput {
-                blocks,
-                connections,
-            },
-            pathfinder,
-            rng,
-        )
-        .unwrap();
+    let layout_input = LayoutInput {
+        blocks,
+        connections,
+    };
+    let l = layouter.layout(&layout_input, pathfinder, rng).unwrap();
 
     let mut b = Blueprint::new();
     for (block, mut assembly_blueprint) in l.positions.iter().zip(blueprints) {
@@ -146,8 +180,8 @@ pub fn generate_factory<L: Layouter, P: Pathfinder>(
         b.add_blueprint(assembly_blueprint);
     }
 
-    for path in &l.path_result {
-        b.add_path(&path[1..], Beltspeed::Fast);
+    for (path, connection) in l.path_result.iter().zip(layout_input.connections.iter()) {
+        b.add_path(&path[1..], connection.beltspeed);
     }
 
     b
diff --git a/factorio-core/src/beltoptions.rs b/factorio-core/src/beltoptions.rs
index a181583..f13031a 100644
--- a/factorio-core/src/beltoptions.rs
+++ b/factorio-core/src/beltoptions.rs
@@ -56,6 +56,20 @@ impl Beltspeed {
         }
         s
     }
+
+    pub fn from_items_per_second(x: f64) -> Self {
+        if x <= 15.0 {
+            Beltspeed::Normal
+        } else if x <= 30.0 {
+            Beltspeed::Fast
+        } else if x <= 45.0 {
+            Beltspeed::Express
+        } else if x <= 60.0 {
+            Beltspeed::Turbo
+        } else {
+            unreachable!()
+        }
+    }
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, ValueEnum)]
diff --git a/factorio-layout/src/genetic_algorithm_v1.rs b/factorio-layout/src/genetic_algorithm_v1.rs
index cadfe2d..84160dd 100644
--- a/factorio-layout/src/genetic_algorithm_v1.rs
+++ b/factorio-layout/src/genetic_algorithm_v1.rs
@@ -31,10 +31,11 @@ impl Layouter for GeneticAlgorithm {
                 }
             }
         }
+        population.sort_by_key(|(_, s)| *s);
+
+        let mut best_result = population[0].clone();
 
         for g in 0..self.generations {
-            population.sort_by_key(|(_, s)| *s);
-
             for i in 0..(self.population_size - self.population_keep - self.population_new) {
                 loop {
                     let parent = &population[i % self.population_keep].0;
@@ -71,11 +72,13 @@ impl Layouter for GeneticAlgorithm {
                 }
             }
 
+            population.sort_by_key(|(_, s)| *s);
+            if population[0].1 < best_result.1 {
+                best_result = population[0].clone();
+            }
             println!("completed generation {g}\nscore: {}", population[0].1);
         }
 
-        population.sort_by_key(|(_, s)| *s);
-
-        population.into_iter().next().map(|(l, _)| l)
+        Some(best_result.0)
     }
 }
diff --git a/factorio-layout/src/lib.rs b/factorio-layout/src/lib.rs
index 74de956..6819ec7 100644
--- a/factorio-layout/src/lib.rs
+++ b/factorio-layout/src/lib.rs
@@ -38,7 +38,7 @@ pub struct LayoutInput {
     pub connections: Vec<Connection>,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct LayoutResult {
     pub size: Position,
     pub positions: Vec<Block>,