diff --git a/pom.xml b/pom.xml
index e7bf4ee1..4b598fcd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -207,6 +207,12 @@
             <artifactId>micrometer-registry-prometheus</artifactId>
             <scope>runtime</scope>
         </dependency>
+        <!-- FIXME: Remove this runtime dependency when variant multithread access is implemented in the network-store -->
+        <dependency>
+            <groupId>com.powsybl</groupId>
+            <artifactId>powsybl-iidm-impl</artifactId>
+            <scope>runtime</scope>
+        </dependency>
 
         <!-- Test dependencies -->
         <dependency>
diff --git a/src/main/java/org/gridsuite/securityanalysis/server/service/SecurityAnalysisParametersService.java b/src/main/java/org/gridsuite/securityanalysis/server/service/SecurityAnalysisParametersService.java
index 03270a42..849de6c9 100644
--- a/src/main/java/org/gridsuite/securityanalysis/server/service/SecurityAnalysisParametersService.java
+++ b/src/main/java/org/gridsuite/securityanalysis/server/service/SecurityAnalysisParametersService.java
@@ -77,14 +77,13 @@ public SecurityAnalysisRunContext createRunContext(UUID networkUuid, String vari
     }
 
     public SecurityAnalysisParametersDTO toSecurityAnalysisParameters(SecurityAnalysisParametersEntity entity) {
-        SecurityAnalysisParameters securityAnalysisParameters;
+        SecurityAnalysisParameters securityAnalysisParameters = SecurityAnalysisParameters.load();
         List<List<Double>> limitReductions = new ArrayList<>();
         if (entity == null) {
-            securityAnalysisParameters = SecurityAnalysisParameters.load()
-                    // the default values are overloaded
-                    .setIncreasedViolationsParameters(getIncreasedViolationsParameters(DEFAULT_FLOW_PROPORTIONAL_THRESHOLD, DEFAULT_LOW_VOLTAGE_PROPORTIONAL_THRESHOLD, DEFAULT_LOW_VOLTAGE_ABSOLUTE_THRESHOLD, DEFAULT_HIGH_VOLTAGE_PROPORTIONAL_THRESHOLD, DEFAULT_HIGH_VOLTAGE_ABSOLUTE_THRESHOLD));
+            // the default values are overloaded
+            securityAnalysisParameters.setIncreasedViolationsParameters(getIncreasedViolationsParameters(DEFAULT_FLOW_PROPORTIONAL_THRESHOLD, DEFAULT_LOW_VOLTAGE_PROPORTIONAL_THRESHOLD, DEFAULT_LOW_VOLTAGE_ABSOLUTE_THRESHOLD, DEFAULT_HIGH_VOLTAGE_PROPORTIONAL_THRESHOLD, DEFAULT_HIGH_VOLTAGE_ABSOLUTE_THRESHOLD));
         } else {
-            securityAnalysisParameters = new SecurityAnalysisParameters().setIncreasedViolationsParameters(getIncreasedViolationsParameters(entity.getFlowProportionalThreshold(), entity.getLowVoltageProportionalThreshold(), entity.getLowVoltageAbsoluteThreshold(), entity.getHighVoltageProportionalThreshold(), entity.getHighVoltageAbsoluteThreshold()));
+            securityAnalysisParameters.setIncreasedViolationsParameters(getIncreasedViolationsParameters(entity.getFlowProportionalThreshold(), entity.getLowVoltageProportionalThreshold(), entity.getLowVoltageAbsoluteThreshold(), entity.getHighVoltageProportionalThreshold(), entity.getHighVoltageAbsoluteThreshold()));
             limitReductions = entity.toLimitReductionsValues();
         }
 
diff --git a/src/main/java/org/gridsuite/securityanalysis/server/service/SecurityAnalysisWorkerService.java b/src/main/java/org/gridsuite/securityanalysis/server/service/SecurityAnalysisWorkerService.java
index 92c473be..0e100078 100644
--- a/src/main/java/org/gridsuite/securityanalysis/server/service/SecurityAnalysisWorkerService.java
+++ b/src/main/java/org/gridsuite/securityanalysis/server/service/SecurityAnalysisWorkerService.java
@@ -18,9 +18,12 @@
 import com.powsybl.iidm.criteria.duration.PermanentDurationCriterion;
 import com.powsybl.iidm.network.LimitType;
 import com.powsybl.iidm.network.Network;
+import com.powsybl.iidm.network.NetworkFactory;
 import com.powsybl.iidm.network.VariantManagerConstants;
+import com.powsybl.iidm.serde.NetworkSerDe;
 import com.powsybl.loadflow.LoadFlowResult;
 import com.powsybl.network.store.client.NetworkStoreService;
+import com.powsybl.network.store.client.PreloadingStrategy;
 import com.powsybl.security.*;
 import com.powsybl.security.limitreduction.LimitReduction;
 import com.powsybl.ws.commons.LogUtils;
@@ -42,6 +45,7 @@
 import java.util.Objects;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
 import java.util.function.Function;
@@ -92,6 +96,11 @@ public SecurityAnalysisResult run(SecurityAnalysisRunContext runContext) {
         }
     }
 
+    @Override
+    protected PreloadingStrategy getNetworkPreloadingStrategy() {
+        return PreloadingStrategy.ALL_COLLECTIONS_NEEDED_FOR_BUS_VIEW;
+    }
+
     @Override
     protected String getComputationType() {
         return COMPUTATION_TYPE;
@@ -108,6 +117,22 @@ protected CompletableFuture<SecurityAnalysisResult> getCompletableFuture(Securit
                 .toList();
         List<LimitReduction> limitReductions = createLimitReductions(runContext);
 
+        Network network = runContext.getNetwork();
+        // FIXME: Remove this part when multithread variant access is implemented in the network-store
+        if (runContext.getProvider().equals("OpenLoadFlow")) {
+            long startTime = System.nanoTime();
+            Network originalNetwork = runContext.getNetwork();
+            String originalVariant = originalNetwork.getVariantManager().getWorkingVariantId();
+            originalNetwork.getVariantManager().setWorkingVariant(variantId);
+
+            network = NetworkSerDe.copy(originalNetwork, NetworkFactory.find("Default"));
+            if (!variantId.equals(VariantManagerConstants.INITIAL_VARIANT_ID)) {
+                network.getVariantManager().cloneVariant(VariantManagerConstants.INITIAL_VARIANT_ID, variantId);
+            }
+            LOGGER.info("Network copied to iidm-impl in {} ms", TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startTime));
+            originalNetwork.getVariantManager().setWorkingVariant(originalVariant);
+        }
+
         SecurityAnalysisRunParameters runParameters = new SecurityAnalysisRunParameters()
                 .setSecurityAnalysisParameters(runContext.getParameters().securityAnalysisParameters())
                 .setComputationManager(executionService.getComputationManager())
@@ -116,7 +141,7 @@ protected CompletableFuture<SecurityAnalysisResult> getCompletableFuture(Securit
                 .setReportNode(runContext.getReportNode());
 
         return securityAnalysisRunner.runAsync(
-                        runContext.getNetwork(),
+                        network,
                         variantId,
                         n -> contingencies,
                         runParameters)
diff --git a/src/test/java/org/gridsuite/securityanalysis/server/SecurityAnalysisControllerTest.java b/src/test/java/org/gridsuite/securityanalysis/server/SecurityAnalysisControllerTest.java
index 93b28428..258ae503 100644
--- a/src/test/java/org/gridsuite/securityanalysis/server/SecurityAnalysisControllerTest.java
+++ b/src/test/java/org/gridsuite/securityanalysis/server/SecurityAnalysisControllerTest.java
@@ -166,9 +166,9 @@ void setUp() throws Exception {
         network.getVariantManager().cloneVariant(VariantManagerConstants.INITIAL_VARIANT_ID, VARIANT_2_ID);
         network.getVariantManager().cloneVariant(VariantManagerConstants.INITIAL_VARIANT_ID, VARIANT_3_ID);
 
-        given(networkStoreService.getNetwork(NETWORK_UUID, PreloadingStrategy.COLLECTION)).willReturn(network);
+        given(networkStoreService.getNetwork(NETWORK_UUID, PreloadingStrategy.ALL_COLLECTIONS_NEEDED_FOR_BUS_VIEW)).willReturn(network);
 
-        when(networkStoreService.getNetwork(NETWORK_STOP_UUID, PreloadingStrategy.COLLECTION)).thenAnswer(invocation -> {
+        when(networkStoreService.getNetwork(NETWORK_STOP_UUID, PreloadingStrategy.ALL_COLLECTIONS_NEEDED_FOR_BUS_VIEW)).thenAnswer(invocation -> {
             //Needed so the stop call doesn't arrive too late
             Network network1 = new NetworkFactoryImpl().createNetwork("other", "test");
             network1.getVariantManager().cloneVariant(VariantManagerConstants.INITIAL_VARIANT_ID, VARIANT_TO_STOP_ID);