diff --git a/.gitignore b/.gitignore
index 51f76b0f716b8fccc6c7546b85e7401aaafcc64c..35e711963d65b9d5501a2876eeb246b29972d25a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ dist
 *.egg-info
 .ipynb_checkpoints
 *.osm
+mapcache
diff --git a/evaluation/configs/bigger.yaml b/evaluation/configs/bigger.yaml
index 9d2ddd5e36588a98987a2197f3cf427f9c9a22fd..1076d0b70d514ad3ce4a29b544280af2c1da6aa4 100644
--- a/evaluation/configs/bigger.yaml
+++ b/evaluation/configs/bigger.yaml
@@ -5,7 +5,7 @@ type: query
 charging_stations: charging_stations.json
 maps:
   - oberpfalz-latest.osm
-queries_per_setup: 1
+queries_per_setup: 10
 setups:
   - mu_s: 300 # Start and Target Soc
     mu_t: 0
@@ -13,4 +13,25 @@ setups:
     capacity: 300 # kWh
     consumption:
       type: gasstation
-      consumption_coefficient: 0.5 # kWh/s
+      consumption_coefficient: 0.1 # kWh/s
+  - mu_s: 300 # Start and Target Soc
+      mu_t: 0
+      charging_stations: 20 # Max Number of charging Stations to be inserted.
+      capacity: 300 # kWh
+      consumption:
+        type: gasstation
+        consumption_coefficient: 0.1 # kWh/s
+  - mu_s: 300 # Start and Target Soc
+      mu_t: 0
+      charging_stations: 40 # Max Number of charging Stations to be inserted.
+      capacity: 300 # kWh
+      consumption:
+        type: gasstation
+        consumption_coefficient: 0.1 # kWh/s
+  - mu_s: 300 # Start and Target Soc
+      mu_t: 0
+      charging_stations: 100 # Max Number of charging Stations to be inserted.
+      capacity: 300 # kWh
+      consumption:
+        type: gasstation
+        consumption_coefficient: 0.1 # kWh/s
diff --git a/evaluation/configs/example.yaml b/evaluation/configs/example.yaml
index 7e10dac1b858d9d42a954c4a2f445c7fa1789b71..73d27e726e74b3941a6e0ea7585fefb47d09e013 100644
--- a/evaluation/configs/example.yaml
+++ b/evaluation/configs/example.yaml
@@ -9,8 +9,22 @@ queries_per_setup: 100
 setups:
   - mu_s: 300 # Start and Target Soc
     mu_t: 0
-    charging_stations: 10 # Max Number of charging Stations to be inserted.
+    charging_stations: 1 # Max Number of charging Stations to be inserted.
     capacity: 300 # kWh
     consumption:
       type: gasstation
-      consumption_coefficient: 0.5 # kWh/s
+      consumption_coefficient: 0.1 # kWh/s
+  - mu_s: 300 # Start and Target Soc
+    mu_t: 0
+    charging_stations: 2 # Max Number of charging Stations to be inserted.
+    capacity: 300 # kWh
+    consumption:
+      type: gasstation
+      consumption_coefficient: 0.1 # kWh/s
+  - mu_s: 300 # Start and Target Soc
+    mu_t: 0
+    charging_stations: 3 # Max Number of charging Stations to be inserted.
+    capacity: 300 # kWh
+    consumption:
+      type: gasstation
+      consumption_coefficient: 0.1 # kWh/s
diff --git a/evaluation/results/bigger/queries/astar.csv b/evaluation/results/bigger/queries/astar.csv
new file mode 100644
index 0000000000000000000000000000000000000000..1c858b7c3e4628e50ea4a7ceb545bf5505b9ae4f
--- /dev/null
+++ b/evaluation/results/bigger/queries/astar.csv
@@ -0,0 +1,2 @@
+start_node,target_node,query_time,trip_time,nodes,edges,charging_stations
+287518807,3810958499,0.6319389899999805,2573.612171235915,726484,1483098,256
diff --git a/evaluation/results/bigger/queries/charge.csv b/evaluation/results/bigger/queries/charge.csv
new file mode 100644
index 0000000000000000000000000000000000000000..92308a57cd0bb052786332af8cbaf1d9e7d91837
--- /dev/null
+++ b/evaluation/results/bigger/queries/charge.csv
@@ -0,0 +1,2 @@
+start_node,target_node,query_time,trip_time,nodes,edges,charging_stations
+287518807,3810958499,4.758653935999973,None,726484,1483098,256
diff --git a/evaluation/results/bigger/queries/classic.csv b/evaluation/results/bigger/queries/classic.csv
new file mode 100644
index 0000000000000000000000000000000000000000..55fadf32cb172700bc07230836d29479e1bb6113
--- /dev/null
+++ b/evaluation/results/bigger/queries/classic.csv
@@ -0,0 +1,2 @@
+start_node,target_node,query_time,trip_time,nodes,edges,charging_stations,dijkstra_rank
+287518807,3810958499,0.36018652400002793,2573.612171235915,726484,1483098,256,0
diff --git a/evaluation/results/example/queries/astar.csv b/evaluation/results/example/queries/astar.csv
index f0132aac97cb5dfb46539e1711a444b68d2a6570..fe730fb8bdc47baeacc2eb86a78a735a423c9181 100644
--- a/evaluation/results/example/queries/astar.csv
+++ b/evaluation/results/example/queries/astar.csv
@@ -1,101 +1,101 @@
 start_node,target_node,query_time,trip_time,nodes,edges,charging_stations
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diff --git a/evaluation/results/example/queries/charge.csv b/evaluation/results/example/queries/charge.csv
index 778a20b2dd119d8f2331347a6c67a40e9e0dd042..035fffb1e19d94668fc7557974547ed295e56eef 100644
--- a/evaluation/results/example/queries/charge.csv
+++ b/evaluation/results/example/queries/charge.csv
@@ -1,101 +1,101 @@
 start_node,target_node,query_time,trip_time,nodes,edges,charging_stations
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diff --git a/evaluation/results/example/queries/classic.csv b/evaluation/results/example/queries/classic.csv
index 0e3c393ebfe58804a7640faedd238a6a89b3a99b..977d13b20935ba84af57bdca8476928e26d3dab9 100644
--- a/evaluation/results/example/queries/classic.csv
+++ b/evaluation/results/example/queries/classic.csv
@@ -1,101 +1,101 @@
 start_node,target_node,query_time,trip_time,nodes,edges,charging_stations,dijkstra_rank
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diff --git a/evaluation/results/example/queries/gasstation.csv b/evaluation/results/example/queries/gasstation.csv
index 049b294ac5dd4e828682cb4fe31cf9dffbf6868e..3f1a638799f7ad4772bdd7a9d292803824a4d700 100644
--- a/evaluation/results/example/queries/gasstation.csv
+++ b/evaluation/results/example/queries/gasstation.csv
@@ -1,101 +1,24 @@
 start_node,target_node,query_time,trip_time,nodes,edges,charging_stations,time_contracted_graph,time_state_graph
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diff --git a/evaluation/run.py b/evaluation/run.py
index 8684b4b8d974087205602afd9d9dab638a4b8d8a..95733d8ac6cbf7b470cf8c73d5dbef2de261b817 100644
--- a/evaluation/run.py
+++ b/evaluation/run.py
@@ -1,6 +1,7 @@
 import argparse
 import json
 import random
+import pickle
 import logging
 from time import perf_counter
 from pathlib import Path
@@ -11,22 +12,30 @@ from lib.T import *
 from lib.export import write_head, write_row
 from lib.queries import *
 
+base = Path(__file__).parent
+
 
 def query_benchmark(graphs, conf, result_dir):
+    # Charging Stations
+    cs_path = base.joinpath('static').joinpath(conf['charging_stations'])
+    with cs_path.open() as f:
+        charging_stations = json.load(f)
+
     query_conf = [
-        Query(query_function=gasstation_query,
-              filename='gasstation.csv',
-              row_dataclass=GasstationQueryRow),
+        # Query(query_function=gasstation_query,
+        #      filename='gasstation.csv',
+        #      row_dataclass=GasstationQueryRow),
         Query(charge_query, 'charge.csv', ChargeQueryRow),
         Query(classic_query, 'classic.csv', ClassicQueryRow),
         Query(astar_query, 'astar.csv', AStarQueryRow)
     ]
 
     for map_name, G in zip(conf['maps'], graphs):
-        nodes = random.choices(list(G.nodes), k=2 * conf['queries_per_setup'])
+        nodes = random.sample(list(G.nodes), k=2 * conf['queries_per_setup'])
         for setup in conf['setups']:
             start_nodes = nodes[:int(len(nodes) / 2)]
             target_nodes = nodes[int(len(nodes) / 2):]
+            insert_charging_stations(G, setup['charging_stations'], charging_stations)
 
             for func, filename, row_class in query_conf:
                 logging.info('Running {} queries with {} on map {}'.format(
@@ -40,26 +49,35 @@ def query_benchmark(graphs, conf, result_dir):
                         write_row(f, func(G, setup, s, t))
 
 
-def get_map(osm_path: Path, cs_path: Path):
+def insert_charging_stations(graph, number, charging_stations):
     start = perf_counter()
-    graph = read_osm(str(osm_path))
+    graph.insert_charging_stations(charging_stations, number)
     runtime = perf_counter() - start
 
-    logging.info('Importing map {} took {:.2f} s'.format(
-        osm_path.name,
+    logging.info('Importing {} Charging Stations took {:.2f} s'.format(
+        len(graph.charging_stations),
         runtime
     ))
 
-    start = perf_counter()
-    with cs_path.open() as f:
-        cs = json.load(f)
-    graph.insert_charging_stations(cs)
-    runtime = perf_counter() - start
 
-    logging.info('Importing {} Charging Stations took {:.2f} s'.format(
-        len(cs),
-        runtime
-    ))
+def get_map(osm_path: Path, backup_dir=None):
+    logging.info('Importing map {}'.format(osm_path.name))
+    cache_path = backup_dir.joinpath(osm_path.with_suffix('.pck').name)
+    try:
+        with open(cache_path, 'rb') as f:
+            graph = pickle.load(f)
+        logging.info('Loaded map from cache {}'.format(cache_path))
+    except FileNotFoundError:
+        start = perf_counter()
+        graph = read_osm(str(osm_path))
+        runtime = perf_counter() - start
+        logging.info('Importing map took {:.2f} s'.format(
+            runtime
+        ))
+        with open(cache_path, 'wb') as f:
+            pickle.dump(graph, f)
+    else:
+        graph.rebuild_rtree()
 
     return graph
 
@@ -78,14 +96,11 @@ if __name__ == '__main__':
     logging.basicConfig(
         format='%(asctime)s %(message)s',
         datefmt='%m/%d/%Y %I:%M:%S %p',
-        level=logging.INFO)
-    base = Path(__file__).parent
+        level=logging.DEBUG)
     results_dir = base.joinpath('results')
     static_dir = base.joinpath('static')
     maps_dir = static_dir.joinpath('maps')
-
-    # Charging Stations
-    cs_path = static_dir.joinpath('charging_stations.json')
+    maps_cache_dir = static_dir.joinpath('mapcache')
 
     parser = argparse.ArgumentParser(description='Run Benchmark Scripts.')
     parser.add_argument(
@@ -106,7 +121,10 @@ if __name__ == '__main__':
         with base.joinpath('configs/', path).open() as f:
             conf = apply_conversions(yaml.load(f, Loader=yaml.Loader))
 
-        graphs = [get_map(maps_dir.joinpath(m), cs_path) for m in conf['maps']]
+        graphs = [
+            get_map(maps_dir.joinpath(m), maps_cache_dir)
+            for m in conf['maps']
+        ]
 
         if conf['type'] == 'query':
             query_dir = benchmark_dir.joinpath('queries')
diff --git a/evrouting/charge/routing.py b/evrouting/charge/routing.py
index e87efa2e178f038d17246b4cf10958aa53545aa8..757525829947bd23a0a5160f61a5c4ea07bd72f5 100644
--- a/evrouting/charge/routing.py
+++ b/evrouting/charge/routing.py
@@ -39,7 +39,7 @@ def shortest_path(G: nx.DiGraph, charging_stations: Set[Node], s: Node, t: Node,
 
     :return:
     """
-    t, factories, queues = _setup(
+    t, dummy_cs, factories, queues = _setup(
         G=G,
         charging_stations=charging_stations,
         capacity=capacity,
@@ -69,6 +69,8 @@ def shortest_path(G: nx.DiGraph, charging_stations: Set[Node], s: Node, t: Node,
 
         if node_min == t:
             G.remove_node(t)
+            charging_stations.remove(dummy_cs)
+
             return _result(
                 label_node_min, f_soc_factory(label_node_min).minimum
             )
@@ -137,13 +139,14 @@ def shortest_path(G: nx.DiGraph, charging_stations: Set[Node], s: Node, t: Node,
                     prio_queue.insert(n, **keys(f_soc_factory(label_neighbour)))
 
     G.remove_node(t)
+    charging_stations.remove(dummy_cs)
     return EmptyResult()
 
 
 def _setup(G: nx.Graph, charging_stations: Set[Node], capacity: SoC,
            initial_soc: SoC, final_soc: SoC, s: Node, t: Node,
            c: ConsumptionFunction
-           ) -> Tuple[Node, Dict, Dict]:
+           ) -> Tuple[Node, Node, Dict, Dict]:
     """
     Initialises the data structures and graph setup.
 
@@ -203,6 +206,7 @@ def _setup(G: nx.Graph, charging_stations: Set[Node], capacity: SoC,
     prio_queue.insert(s, priority=0, count=0)
 
     return (t,  # New final Node
+            dummy_node,
             {  # factories
                 'f_soc': f_soc_factory,
                 'cf': cf_map,
diff --git a/evrouting/gasstation/routing.py b/evrouting/gasstation/routing.py
index b142a7dfb5260b6a9ca63a279def792857022ef0..ca26c2e19f67e6b87646dd8c151052d6344be196 100644
--- a/evrouting/gasstation/routing.py
+++ b/evrouting/gasstation/routing.py
@@ -1,3 +1,4 @@
+import logging
 from typing import Set, List
 
 import networkx as nx
@@ -9,6 +10,8 @@ from evrouting.graph_tools import (
     AccessFunctions
 )
 
+logger = logging.getLogger(__name__)
+
 
 def insert_start_node(s: Node,
                       graph_core: nx.Graph,
@@ -109,6 +112,9 @@ def contract_graph(G: nx.Graph, charging_stations: Set[Node], capacity: SoC,
         return H
 
     all_cs = list(charging_stations)
+    logger.debug(f'Contracting on {len(all_cs)} charging stations.')
+    done = 0
+    total = len(all_cs) * (len(all_cs) - 1) / 2
     for i in range(len(all_cs) - 1):
         cs = all_cs[i]
         H.add_node(cs, **G.nodes[cs])
@@ -127,6 +133,9 @@ def contract_graph(G: nx.Graph, charging_stations: Set[Node], capacity: SoC,
                         DISTANCE_KEY: f.path_distance(G, path)
                     }
                 )
+        done += len(all_cs) - i - 1
+        logger.debug(f'{done}/{total} evaluated.')
+
     H.add_node(all_cs[-1], **G.nodes[all_cs[-1]])
 
     return H
diff --git a/evrouting/graph_tools.py b/evrouting/graph_tools.py
index 584129e710c32a29e7abb6d8046a2f51ab4812d1..0807efe8b0eb840fb11d860683f8d473739be1ae 100644
--- a/evrouting/graph_tools.py
+++ b/evrouting/graph_tools.py
@@ -119,18 +119,3 @@ class AccessFunctions:
 
     def shortest_path(self, G, u, v):
         return nx.algorithms.shortest_path(G, u, v, weight=DISTANCE_KEY)
-
-
-class GasstationAccessFunctions(AccessFunctions):
-    def __init__(self, consumption_coefficient):
-        super().__init__()
-        self.c = consumption_coefficient
-
-    def consumption(self, G, u, v):
-        return self.c * self._distance(G, u, v)
-
-    def charging_coefficient(self, G, v):
-        return 1 / self._charging_coefficient(G, v)
-
-    def path_consumption(self, G, path):
-        return self.c * self.path_distance(G, path)
diff --git a/evrouting/osm/imports.py b/evrouting/osm/imports.py
index a293532fb3d9a715056fdfd60c29faf4b4fda879..07ebd2fe5f377c975fa29022685ca6ba3cf2a2ff 100644
--- a/evrouting/osm/imports.py
+++ b/evrouting/osm/imports.py
@@ -14,6 +14,7 @@ Added :
 import xml.sax
 import logging
 import itertools
+import random
 from collections import namedtuple, defaultdict
 
 import networkx as nx
@@ -62,16 +63,28 @@ class OSMGraph(nx.DiGraph):
         for n in self.nodes:
             self.insert_into_rtree(n)
 
-    def insert_charging_stations(self, charging_stations):
+    def insert_charging_stations(self, charging_stations, num=None):
         """Insert Charging Stations"""
+        # Clean data
+        for n in self.charging_stations:
+            del self.nodes[n][CHARGING_COEFFICIENT_KEY]
+
         S = set()
+        candidates = []
         for s in charging_stations:
-            lon = s['lon']
-            lat = s['lat']
-            n = self.find_nearest((lat, lon), distance_limit=500)
+            n = self.find_nearest((s['lat'], s['lon']), distance_limit=500)
             if n is not None:
-                self.nodes[n][CHARGING_COEFFICIENT_KEY] = s['power'] / 3.6  # in Wh/s
-                S.add(n)
+                candidates.append((n, s))
+
+        if num is not None:
+            try:
+                candidates = random.sample(candidates, num)
+            except ValueError:
+                pass
+
+        for n, s in candidates:
+            self.nodes[n][CHARGING_COEFFICIENT_KEY] = s['power'] / 3.6  # in Wh/s
+            S.add(n)
 
         self.charging_stations = S
 
@@ -107,7 +120,6 @@ def read_osm(osm_xml_data, profile=car) -> OSMGraph:
     Create Graph containing all highways as edges.
 
     """
-
     osm = OSM(osm_xml_data)
     G = OSMGraph()