diff --git a/engine/src/main.rs b/engine/src/main.rs
index 818755c4..2f0a58a8 100644
--- a/engine/src/main.rs
+++ b/engine/src/main.rs
@@ -1,5 +1,6 @@
 use std::env;
 use std::path::Path;
+use std::sync::Arc;
 
 extern crate bmw_routing_engine;
 
@@ -32,9 +33,9 @@ fn main() {
     let to = read_into_vector(path.join("test/target").to_str().unwrap()).expect("could not read target");
     let ground_truth = read_into_vector(path.join("test/travel_time_length").to_str().unwrap()).expect("could not read travel_time_length");
 
-    let graph = Graph::new(first_out, head, travel_time);
+    let graph = Arc::new(Graph::new(first_out, head, travel_time));
     let mut simple_server = DijkServer::new(graph.clone());
-    let mut bi_dir_server = BiDijkServer::<Graph, Graph>::new(graph.clone());
+    let mut bi_dir_server = BiDijkServer::new(graph.clone());
     let async_server = AsyncDijkServer::new(graph.clone());
     let mut async_bi_dir_server = AsyncBiDijkServer::new(graph.clone());
 
@@ -47,7 +48,7 @@ fn main() {
         inverted_order[node as usize] = i as u32;
     }
     let mut ch_server = CHServer::new((Graph::new(ch_first_out, ch_head, ch_weight).ch_split(&inverted_order), None));
-    let mut ch_server_with_own_ch = CHServer::new(contraction_hierarchy::contract(graph, ch_order));
+    let mut ch_server_with_own_ch = CHServer::new(contraction_hierarchy::contract(&graph, ch_order));
 
     for ((&from, &to), &ground_truth) in from.iter().zip(to.iter()).zip(ground_truth.iter()).take(100) {
         let ground_truth = match ground_truth {
diff --git a/engine/src/shortest_path/contraction_hierarchy/mod.rs b/engine/src/shortest_path/contraction_hierarchy/mod.rs
index 6ddc5b01..dbe51732 100644
--- a/engine/src/shortest_path/contraction_hierarchy/mod.rs
+++ b/engine/src/shortest_path/contraction_hierarchy/mod.rs
@@ -58,7 +58,7 @@ struct ContractionGraph {
 }
 
 impl ContractionGraph {
-    fn new(graph: FirstOutGraph, node_order: Vec<NodeId>) -> ContractionGraph {
+    fn new(graph: &FirstOutGraph, node_order: Vec<NodeId>) -> ContractionGraph {
         let n = graph.num_nodes();
         let mut node_ranks = vec![0; n];
         for (i, &node) in node_order.iter().enumerate() {
@@ -164,8 +164,8 @@ impl<'a> PartialContractionGraph<'a> {
 
     fn shortcut_required(&self, from: NodeId, to: NodeId, shortcut_weight: Weight) -> bool {
         let mut server = ::shortest_path::query::bidirectional_dijkstra::Server {
-            forward_dijkstra: SteppedDijkstra::new(ForwardWrapper { graph: &self }),
-            backward_dijkstra: SteppedDijkstra::new(BackwardWrapper { graph: &self }),
+            forward_dijkstra: SteppedDijkstra::new(Box::new(ForwardWrapper { graph: &self })),
+            backward_dijkstra: SteppedDijkstra::new(Box::new(BackwardWrapper { graph: &self })),
             tentative_distance: INFINITY,
             maximum_distance: shortcut_weight,
             meeting_node: 0
@@ -179,7 +179,7 @@ impl<'a> PartialContractionGraph<'a> {
     }
 }
 
-pub fn contract(graph: FirstOutGraph, node_order: Vec<NodeId>) -> ((FirstOutGraph, FirstOutGraph), Option<(Vec<NodeId>, Vec<NodeId>)>) {
+pub fn contract(graph: &FirstOutGraph, node_order: Vec<NodeId>) -> ((FirstOutGraph, FirstOutGraph), Option<(Vec<NodeId>, Vec<NodeId>)>) {
     let mut graph = ContractionGraph::new(graph, node_order);
     graph.contract();
     graph.as_first_out_graphs()
diff --git a/engine/src/shortest_path/query/async/bidirectional_dijkstra.rs b/engine/src/shortest_path/query/async/bidirectional_dijkstra.rs
index 31be2240..cca82460 100644
--- a/engine/src/shortest_path/query/async/bidirectional_dijkstra.rs
+++ b/engine/src/shortest_path/query/async/bidirectional_dijkstra.rs
@@ -4,6 +4,7 @@ use std::ptr;
 use std::sync::{Arc, Barrier};
 use std::sync::atomic::compiler_fence;
 use std::sync::atomic::Ordering::SeqCst;
+use std::ops::Deref;
 
 use shortest_path::timestamped_vector::TimestampedVector;
 
@@ -28,7 +29,7 @@ pub struct Server {
 }
 
 impl Server {
-    pub fn new(graph: Graph) -> Server {
+    pub fn new<C: 'static + Send + Deref<Target = Graph>>(graph: C) -> Server {
         let (forward_query_sender, forward_query_receiver) = channel();
         let (forward_progress_sender, forward_progress_receiver) = channel();
         let (backward_query_sender, backward_query_receiver) = channel();
@@ -79,7 +80,7 @@ impl Server {
         });
 
         thread::spawn(move || {
-            let mut dijkstra = SteppedDijkstra::new(reversed);
+            let mut dijkstra = SteppedDijkstra::new(Box::new(reversed));
 
             unsafe { *backward_distances_pointer.pointer = dijkstra.distances_pointer() };
             compiler_fence(SeqCst);
diff --git a/engine/src/shortest_path/query/async/dijkstra.rs b/engine/src/shortest_path/query/async/dijkstra.rs
index 5864d171..66e4f81d 100644
--- a/engine/src/shortest_path/query/async/dijkstra.rs
+++ b/engine/src/shortest_path/query/async/dijkstra.rs
@@ -1,5 +1,7 @@
 use super::*;
 
+use std::ops::Deref;
+
 #[derive(Debug)]
 pub struct Server {
     query_sender: Sender<ServerControl>,
@@ -7,7 +9,7 @@ pub struct Server {
 }
 
 impl Server {
-    pub fn new(graph: Graph) -> Server {
+    pub fn new<C: 'static + Send + Deref<Target = Graph>>(graph: C) -> Server {
         let (query_sender, query_receiver) = channel();
         let (progress_sender, progress_receiver) = channel();
 
diff --git a/engine/src/shortest_path/query/bidirectional_dijkstra.rs b/engine/src/shortest_path/query/bidirectional_dijkstra.rs
index 8e3e5525..0317b4c0 100644
--- a/engine/src/shortest_path/query/bidirectional_dijkstra.rs
+++ b/engine/src/shortest_path/query/bidirectional_dijkstra.rs
@@ -1,28 +1,32 @@
 use std::collections::LinkedList;
+use std::ops::Deref;
+
 use super::*;
 
 #[derive(Debug)]
-pub struct Server<G: DijkstrableGraph, H: DijkstrableGraph> {
-    pub forward_dijkstra: SteppedDijkstra<G>,
-    pub backward_dijkstra: SteppedDijkstra<H>,
+pub struct Server<G: DijkstrableGraph, H: DijkstrableGraph, C: Deref<Target = G>> {
+    pub forward_dijkstra: SteppedDijkstra<G, C>,
+    pub backward_dijkstra: SteppedDijkstra<H, Box<H>>,
     pub tentative_distance: Weight,
     pub maximum_distance: Weight,
     pub meeting_node: NodeId
 }
 
-impl<G: DijkstrableGraph, H: DijkstrableGraph> Server<G, H> {
-    pub fn new(graph: Graph) -> Server<Graph, Graph> {
+impl<C: Deref<Target = Graph>> Server<Graph, Graph, C> {
+    pub fn new(graph: C) -> Server<Graph, Graph, C> {
         let reversed = graph.reverse();
 
         Server {
             forward_dijkstra: SteppedDijkstra::new(graph),
-            backward_dijkstra: SteppedDijkstra::new(reversed),
+            backward_dijkstra: SteppedDijkstra::new(Box::new(reversed)),
             tentative_distance: INFINITY,
             maximum_distance: INFINITY,
             meeting_node: 0
         }
     }
+}
 
+impl<G: DijkstrableGraph, H: DijkstrableGraph, C: Deref<Target = G>> Server<G, H, C> {
     pub fn distance(&mut self, from: NodeId, to: NodeId) -> Option<Weight> {
         // initialize
         self.tentative_distance = INFINITY;
diff --git a/engine/src/shortest_path/query/contraction_hierarchy.rs b/engine/src/shortest_path/query/contraction_hierarchy.rs
index 3f84d100..f1bff498 100644
--- a/engine/src/shortest_path/query/contraction_hierarchy.rs
+++ b/engine/src/shortest_path/query/contraction_hierarchy.rs
@@ -3,8 +3,8 @@ use super::*;
 
 #[derive(Debug)]
 pub struct Server {
-    forward_dijkstra: SteppedDijkstra<Graph>,
-    backward_dijkstra: SteppedDijkstra<Graph>,
+    forward_dijkstra: SteppedDijkstra<Graph, Box<Graph>>,
+    backward_dijkstra: SteppedDijkstra<Graph, Box<Graph>>,
     tentative_distance: Weight,
     meeting_node: NodeId,
     shortcut_middle_nodes: Option<(Vec<NodeId>, Vec<NodeId>)>
@@ -13,8 +13,8 @@ pub struct Server {
 impl Server {
     pub fn new(((up, down), shortcut_middle_nodes): ((Graph, Graph), Option<(Vec<NodeId>, Vec<NodeId>)>)) -> Server {
         Server {
-            forward_dijkstra: SteppedDijkstra::new(up),
-            backward_dijkstra: SteppedDijkstra::new(down),
+            forward_dijkstra: SteppedDijkstra::new(Box::new(up)),
+            backward_dijkstra: SteppedDijkstra::new(Box::new(down)),
             tentative_distance: INFINITY,
             meeting_node: 0,
             shortcut_middle_nodes
diff --git a/engine/src/shortest_path/query/dijkstra.rs b/engine/src/shortest_path/query/dijkstra.rs
index b24caa39..fa327d39 100644
--- a/engine/src/shortest_path/query/dijkstra.rs
+++ b/engine/src/shortest_path/query/dijkstra.rs
@@ -1,14 +1,15 @@
 use super::*;
 
+use std::ops::Deref;
 use std::collections::LinkedList;
 
 #[derive(Debug)]
-pub struct Server {
-    dijkstra: SteppedDijkstra<Graph>,
+pub struct Server<C: Deref<Target = Graph>> {
+    dijkstra: SteppedDijkstra<Graph, C>,
 }
 
-impl Server {
-    pub fn new(graph: Graph) -> Server {
+impl<C: Deref<Target = Graph>> Server<C> {
+    pub fn new(graph: C) -> Server<C> {
         Server {
             dijkstra: SteppedDijkstra::new(graph)
         }
diff --git a/engine/src/shortest_path/stepped_dijkstra.rs b/engine/src/shortest_path/stepped_dijkstra.rs
index 8e567c21..dacd3108 100644
--- a/engine/src/shortest_path/stepped_dijkstra.rs
+++ b/engine/src/shortest_path/stepped_dijkstra.rs
@@ -1,4 +1,5 @@
 use super::*;
+use std::ops::Deref;
 use index_heap::{IndexdMinHeap, Indexing};
 use super::timestamped_vector::TimestampedVector;
 
@@ -21,8 +22,8 @@ impl Indexing for State {
 }
 
 #[derive(Debug)]
-pub struct SteppedDijkstra<Graph: DijkstrableGraph> {
-    graph: Graph,
+pub struct SteppedDijkstra<Graph: DijkstrableGraph, C: Deref<Target = Graph>> {
+    graph: C,
     distances: TimestampedVector<Weight>,
     predecessors: Vec<NodeId>,
     closest_node_priority_queue: IndexdMinHeap<State>,
@@ -32,8 +33,8 @@ pub struct SteppedDijkstra<Graph: DijkstrableGraph> {
     result: Option<Option<Weight>>
 }
 
-impl<Graph: DijkstrableGraph> SteppedDijkstra<Graph> {
-    pub fn new(graph: Graph) -> SteppedDijkstra<Graph> {
+impl<Graph: DijkstrableGraph, C: Deref<Target = Graph>> SteppedDijkstra<Graph, C> {
+    pub fn new(graph: C) -> SteppedDijkstra<Graph, C> {
         let n = graph.num_nodes();
 
         SteppedDijkstra {
diff --git a/search_space_visualization/src/main.rs b/search_space_visualization/src/main.rs
index 21663e6f..ca21fdbc 100644
--- a/search_space_visualization/src/main.rs
+++ b/search_space_visualization/src/main.rs
@@ -10,6 +10,7 @@ use std::env;
 use std::path::Path;
 use std::cmp::max;
 use std::cmp::Ordering;
+use std::rc::Rc;
 
 use bmw_routing_engine::*;
 use graph::first_out_graph::FirstOutGraph as Graph;
@@ -82,8 +83,8 @@ fn main() {
     let head = read_into_vector(path.join("head").to_str().unwrap()).expect("could not read head");
     let travel_time = read_into_vector(path.join("travel_time").to_str().unwrap()).expect("could not read travel_time");
 
-    let graph = Graph::new(first_out, head, travel_time);
-    let mut query_server = DijkServer::<Graph, Graph>::new(graph.clone());
+    let graph = Rc::new(Graph::new(first_out, head, travel_time));
+    let mut query_server = DijkServer::new(graph.clone());
 
     let find_closest = |(p_lat, p_lon): (f32, f32)| -> NodeId {
         lat.iter().zip(lon.iter()).enumerate().min_by_key(|&(_, (lat, lon))| {
diff --git a/server/src/main.rs b/server/src/main.rs
index 3044c705..05a11d17 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -45,7 +45,7 @@ impl Ord for NonNan {
 
 #[derive(Debug)]
 struct RoutingWrapper {
-    server: shortest_path::query::bidirectional_dijkstra::Server<Graph, Graph>,
+    server: shortest_path::query::bidirectional_dijkstra::Server<Graph, Graph, Box<Graph>>,
     lat: Vec<f32>,
     lng: Vec<f32>
 }
@@ -118,7 +118,7 @@ fn main() {
     let lng = read_into_vector(path.join("longitude").to_str().unwrap()).expect("could not read first_out");
 
     let wrapper = RoutingWrapper {
-        server: shortest_path::query::bidirectional_dijkstra::Server::<Graph, Graph>::new(graph), lat, lng
+        server: shortest_path::query::bidirectional_dijkstra::Server::new(Box::new(graph)), lat, lng
     };
 
     let config = rocket::config::Config::build(rocket::config::Environment::Staging)