diff --git a/src/main/java/net/fabricmc/loom/LoomGradleExtension.java b/src/main/java/net/fabricmc/loom/LoomGradleExtension.java
index 8d93e47b..aa74bab0 100644
--- a/src/main/java/net/fabricmc/loom/LoomGradleExtension.java
+++ b/src/main/java/net/fabricmc/loom/LoomGradleExtension.java
@@ -108,4 +108,12 @@ public interface LoomGradleExtension extends LoomGradleExtensionAPI {
 	boolean refreshDeps();
 
 	void setRefreshDeps(boolean refreshDeps);
+
+	/**
+	 * If true, multi-project optimisation mode is enabled. This mode makes builds with many Loom projects
+	 * much faster by increasing sharing and disabling some functionality.
+	 *
+	 * <p>You can enable it by setting the Gradle property {@code fabric.loom.multiProjectOptimisation} to {@code true}.
+	 */
+	boolean multiProjectOptimisation();
 }
diff --git a/src/main/java/net/fabricmc/loom/build/mixin/AnnotationProcessorInvoker.java b/src/main/java/net/fabricmc/loom/build/mixin/AnnotationProcessorInvoker.java
index 7e3c3815..d0417961 100644
--- a/src/main/java/net/fabricmc/loom/build/mixin/AnnotationProcessorInvoker.java
+++ b/src/main/java/net/fabricmc/loom/build/mixin/AnnotationProcessorInvoker.java
@@ -62,6 +62,7 @@ public abstract class AnnotationProcessorInvoker<T extends Task> {
 	private static final Pattern MSG_VALUE_PATTERN = Pattern.compile("^(note|warning|error|disabled)$");
 
 	protected final Project project;
+	private final LoomGradleExtension loomExtension;
 	protected final MixinExtension mixinExtension;
 	protected final Map<SourceSet, T> invokerTasks;
 	private final Collection<Configuration> apConfigurations;
@@ -70,7 +71,8 @@ public abstract class AnnotationProcessorInvoker<T extends Task> {
 										Collection<Configuration> apConfigurations,
 										Map<SourceSet, T> invokerTasks) {
 		this.project = project;
-		this.mixinExtension = LoomGradleExtension.get(project).getMixin();
+		this.loomExtension = LoomGradleExtension.get(project);
+		this.mixinExtension = loomExtension.getMixin();
 		this.apConfigurations = apConfigurations;
 		this.invokerTasks = invokerTasks;
 	}
@@ -111,8 +113,10 @@ public abstract class AnnotationProcessorInvoker<T extends Task> {
 				args.put("MSG_" + key, value);
 			});
 
-			// Ensure that all of the mixin mappings have been generated before we create the mixin mappings.
-			runBeforePrepare(project, task);
+			if (loomExtension.multiProjectOptimisation()) {
+				// Ensure that all of the mixin mappings have been generated before we create the mixin mappings.
+				runBeforePrepare(project, task);
+			}
 
 			project.getLogger().debug("Outputting refmap to dir: " + getRefmapDestinationDir(task) + " for compile task: " + task);
 			args.forEach((k, v) -> passArgument(task, k, v));
diff --git a/src/main/java/net/fabricmc/loom/extension/LoomGradleExtensionImpl.java b/src/main/java/net/fabricmc/loom/extension/LoomGradleExtensionImpl.java
index b56d06d0..0c2d7c8e 100644
--- a/src/main/java/net/fabricmc/loom/extension/LoomGradleExtensionImpl.java
+++ b/src/main/java/net/fabricmc/loom/extension/LoomGradleExtensionImpl.java
@@ -36,6 +36,7 @@ import org.cadixdev.mercury.Mercury;
 import org.gradle.api.Project;
 import org.gradle.api.file.ConfigurableFileCollection;
 import org.gradle.api.file.FileCollection;
+import org.gradle.api.provider.Provider;
 
 import net.fabricmc.loom.LoomGradleExtension;
 import net.fabricmc.loom.api.mappings.intermediate.IntermediateMappingsProvider;
@@ -48,8 +49,10 @@ import net.fabricmc.loom.configuration.providers.mappings.MappingConfiguration;
 import net.fabricmc.loom.configuration.providers.minecraft.MinecraftProvider;
 import net.fabricmc.loom.configuration.providers.minecraft.mapped.IntermediaryMinecraftProvider;
 import net.fabricmc.loom.configuration.providers.minecraft.mapped.NamedMinecraftProvider;
+import net.fabricmc.loom.util.Constants;
 import net.fabricmc.loom.util.download.Download;
 import net.fabricmc.loom.util.download.DownloadBuilder;
+import net.fabricmc.loom.util.gradle.GradleUtils;
 
 public class LoomGradleExtensionImpl extends LoomGradleExtensionApiImpl implements LoomGradleExtension {
 	private final Project project;
@@ -68,6 +71,7 @@ public class LoomGradleExtensionImpl extends LoomGradleExtensionApiImpl implemen
 	private IntermediaryMinecraftProvider<?> intermediaryMinecraftProvider;
 	private InstallerData installerData;
 	private boolean refreshDeps;
+	private Provider<Boolean> multiProjectOptimisation;
 
 	public LoomGradleExtensionImpl(Project project, LoomFiles files) {
 		super(project, files);
@@ -87,6 +91,7 @@ public class LoomGradleExtensionImpl extends LoomGradleExtensionApiImpl implemen
 		});
 
 		refreshDeps = project.getGradle().getStartParameter().isRefreshDependencies() || Boolean.getBoolean("loom.refresh");
+		multiProjectOptimisation = GradleUtils.getBooleanPropertyProvider(project, Constants.Properties.MULTI_PROJECT_OPTIMISATION);
 
 		if (refreshDeps) {
 			project.getLogger().lifecycle("Refresh dependencies is in use, loom will be significantly slower.");
@@ -237,6 +242,11 @@ public class LoomGradleExtensionImpl extends LoomGradleExtensionApiImpl implemen
 		this.refreshDeps = refreshDeps;
 	}
 
+	@Override
+	public boolean multiProjectOptimisation() {
+		return multiProjectOptimisation.getOrElse(false);
+	}
+
 	@Override
 	protected <T extends IntermediateMappingsProvider> void configureIntermediateMappingsProviderInternal(T provider) {
 		provider.getMinecraftVersion().set(getProject().provider(() -> getMinecraftProvider().minecraftVersion()));
diff --git a/src/main/java/net/fabricmc/loom/task/AbstractRemapJarTask.java b/src/main/java/net/fabricmc/loom/task/AbstractRemapJarTask.java
index 57f7dcdc..f1948b59 100644
--- a/src/main/java/net/fabricmc/loom/task/AbstractRemapJarTask.java
+++ b/src/main/java/net/fabricmc/loom/task/AbstractRemapJarTask.java
@@ -56,7 +56,9 @@ import org.gradle.workers.WorkAction;
 import org.gradle.workers.WorkParameters;
 import org.gradle.workers.WorkQueue;
 import org.gradle.workers.WorkerExecutor;
+import org.jetbrains.annotations.ApiStatus;
 
+import net.fabricmc.loom.LoomGradleExtension;
 import net.fabricmc.loom.api.mappings.layered.MappingsNamespace;
 import net.fabricmc.loom.task.service.JarManifestService;
 import net.fabricmc.loom.util.ZipReprocessorUtil;
@@ -228,4 +230,10 @@ public abstract class AbstractRemapJarTask extends Jar {
 			return s;
 		};
 	}
+
+	@ApiStatus.Internal
+	@Internal
+	protected LoomGradleExtension getLoomExtension() {
+		return LoomGradleExtension.get(getProject());
+	}
 }
diff --git a/src/main/java/net/fabricmc/loom/task/PrepareJarRemapTask.java b/src/main/java/net/fabricmc/loom/task/PrepareJarRemapTask.java
index 360f88ef..ab4c69c0 100644
--- a/src/main/java/net/fabricmc/loom/task/PrepareJarRemapTask.java
+++ b/src/main/java/net/fabricmc/loom/task/PrepareJarRemapTask.java
@@ -39,7 +39,6 @@ import org.gradle.workers.WorkerExecutor;
 
 import net.fabricmc.loom.task.service.TinyRemapperService;
 import net.fabricmc.loom.util.service.UnsafeWorkQueueHelper;
-import net.fabricmc.tinyremapper.TinyRemapper;
 
 /**
  * The prepare remap task runs before all other jar remap tasks, should be used to setup tiny remapper.
@@ -97,10 +96,12 @@ public abstract class PrepareJarRemapTask extends AbstractLoomTask {
 
 		@Override
 		public void execute() {
-			final TinyRemapper tinyRemapper = tinyRemapperService.getTinyRemapperForInputs();
 			final Path inputFile = getParameters().getInputFile().getAsFile().get().toPath();
-
-			tinyRemapper.readInputsAsync(tinyRemapperService.getOrCreateTag(inputFile), inputFile);
+			prepare(tinyRemapperService, inputFile);
 		}
 	}
+
+	static void prepare(TinyRemapperService tinyRemapperService, Path inputFile) {
+		tinyRemapperService.getTinyRemapperForInputs().readInputsAsync(tinyRemapperService.getOrCreateTag(inputFile), inputFile);
+	}
 }
diff --git a/src/main/java/net/fabricmc/loom/task/RemapJarTask.java b/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
index 7b300db6..8a379417 100644
--- a/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
+++ b/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
@@ -27,6 +27,7 @@ package net.fabricmc.loom.task;
 import java.io.IOException;
 import java.io.Serializable;
 import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -106,7 +107,9 @@ public abstract class RemapJarTask extends AbstractRemapJarTask {
 
 		getUseMixinAP().set(LoomGradleExtension.get(getProject()).getMixin().getUseLegacyMixinAp());
 
-		setupPreparationTask();
+		if (getLoomExtension().multiProjectOptimisation()) {
+			setupPreparationTask();
+		}
 	}
 
 	private void setupPreparationTask() {
@@ -134,6 +137,7 @@ public abstract class RemapJarTask extends AbstractRemapJarTask {
 
 			params.getTinyRemapperBuildServiceUuid().set(UnsafeWorkQueueHelper.create(tinyRemapperService.get()));
 			params.getRemapClasspath().from(getClasspath());
+			params.getMultiProjectOptimisation().set(getLoomExtension().multiProjectOptimisation());
 
 			final boolean mixinAp = getUseMixinAP().get();
 			params.getUseMixinExtension().set(!mixinAp);
@@ -181,6 +185,7 @@ public abstract class RemapJarTask extends AbstractRemapJarTask {
 		ConfigurableFileCollection getRemapClasspath();
 
 		Property<Boolean> getUseMixinExtension();
+		Property<Boolean> getMultiProjectOptimisation();
 
 		record RefmapData(List<String> mixinConfigs, String refmapName) implements Serializable { }
 		ListProperty<RefmapData> getMixinData();
@@ -203,6 +208,10 @@ public abstract class RemapJarTask extends AbstractRemapJarTask {
 			try {
 				LOGGER.info("Remapping {} to {}", inputFile, outputFile);
 
+				if (!getParameters().getMultiProjectOptimisation().get()) {
+					prepare();
+				}
+
 				tinyRemapper = tinyRemapperService.getTinyRemapperForRemapping();
 
 				remap();
@@ -217,6 +226,10 @@ public abstract class RemapJarTask extends AbstractRemapJarTask {
 				modifyJarManifest();
 				rewriteJar();
 
+				if (!getParameters().getMultiProjectOptimisation().get()) {
+					tinyRemapperService.close();
+				}
+
 				LOGGER.debug("Finished remapping {}", inputFile);
 			} catch (Exception e) {
 				try {
@@ -229,6 +242,11 @@ public abstract class RemapJarTask extends AbstractRemapJarTask {
 			}
 		}
 
+		private void prepare() {
+			final Path inputFile = getParameters().getInputFile().getAsFile().get().toPath();
+			PrepareJarRemapTask.prepare(tinyRemapperService, inputFile);
+		}
+
 		private void remap() throws IOException {
 			try (OutputConsumerPath outputConsumer = new OutputConsumerPath.Builder(outputFile).build()) {
 				outputConsumer.addNonClassFiles(inputFile);
diff --git a/src/main/java/net/fabricmc/loom/task/RemapTaskConfiguration.java b/src/main/java/net/fabricmc/loom/task/RemapTaskConfiguration.java
index 63702a32..c74d0a9c 100644
--- a/src/main/java/net/fabricmc/loom/task/RemapTaskConfiguration.java
+++ b/src/main/java/net/fabricmc/loom/task/RemapTaskConfiguration.java
@@ -49,7 +49,7 @@ public class RemapTaskConfiguration {
 		final TaskContainer tasks = project.getTasks();
 		final LoomGradleExtension extension = LoomGradleExtension.get(project);
 
-		if (getBooleanProperty(project, "fabric.loom.dontRemap")) {
+		if (GradleUtils.getBooleanProperty(project, Constants.Properties.DONT_REMAP)) {
 			extension.getUnmappedModCollection().from(project.getTasks().getByName(JavaPlugin.JAR_TASK_NAME));
 			return;
 		}
@@ -81,7 +81,7 @@ public class RemapTaskConfiguration {
 
 		trySetupSourceRemapping(project);
 
-		if (getBooleanProperty(project, "fabric.loom.disableRemappedVariants")) {
+		if (GradleUtils.getBooleanProperty(project, Constants.Properties.DISABLE_REMAPPED_VARIANTS)) {
 			return;
 		}
 
@@ -132,7 +132,7 @@ public class RemapTaskConfiguration {
 
 		tasks.named(BasePlugin.ASSEMBLE_TASK_NAME).configure(task -> task.dependsOn(remapSourcesTask));
 
-		if (getBooleanProperty(project, "fabric.loom.disableRemappedVariants")) {
+		if (GradleUtils.getBooleanProperty(project, "fabric.loom.disableRemappedVariants")) {
 			return;
 		}
 
@@ -155,15 +155,4 @@ public class RemapTaskConfiguration {
 			}
 		});
 	}
-
-	private static boolean getBooleanProperty(Project project, String key) {
-		return project.getProviders().gradleProperty(key).map(string -> {
-			try {
-				return Boolean.parseBoolean(string);
-			} catch (final IllegalArgumentException ex) {
-				return false;
-			}
-		})
-		.getOrElse(false);
-	}
 }
diff --git a/src/main/java/net/fabricmc/loom/task/service/TinyRemapperService.java b/src/main/java/net/fabricmc/loom/task/service/TinyRemapperService.java
index 298cdd46..ced8f239 100644
--- a/src/main/java/net/fabricmc/loom/task/service/TinyRemapperService.java
+++ b/src/main/java/net/fabricmc/loom/task/service/TinyRemapperService.java
@@ -73,7 +73,7 @@ public class TinyRemapperService implements SharedService {
 			joiner.add("kotlin-" + kotlinClasspathService.version());
 		}
 
-		if (remapJarTask.getRemapperIsolation().get()) {
+		if (remapJarTask.getRemapperIsolation().get() || !extension.multiProjectOptimisation()) {
 			joiner.add(project.getPath());
 		}
 
diff --git a/src/main/java/net/fabricmc/loom/util/Constants.java b/src/main/java/net/fabricmc/loom/util/Constants.java
index f5e694ea..78eb818d 100644
--- a/src/main/java/net/fabricmc/loom/util/Constants.java
+++ b/src/main/java/net/fabricmc/loom/util/Constants.java
@@ -137,4 +137,10 @@ public class Constants {
 		public static final String INJECTED_INTERFACE = "loom:injected_interfaces";
 		public static final String PROVIDED_JAVADOC = "loom:provided_javadoc";
 	}
+
+	public static final class Properties {
+		public static final String MULTI_PROJECT_OPTIMISATION = "fabric.loom.multiProjectOptimisation";
+		public static final String DONT_REMAP = "fabric.loom.dontRemap";
+		public static final String DISABLE_REMAPPED_VARIANTS = "fabric.loom.disableRemappedVariants";
+	}
 }
diff --git a/src/main/java/net/fabricmc/loom/util/gradle/GradleUtils.java b/src/main/java/net/fabricmc/loom/util/gradle/GradleUtils.java
index 88accb25..6361d235 100644
--- a/src/main/java/net/fabricmc/loom/util/gradle/GradleUtils.java
+++ b/src/main/java/net/fabricmc/loom/util/gradle/GradleUtils.java
@@ -28,6 +28,7 @@ import java.util.function.Consumer;
 
 import org.gradle.api.Project;
 import org.gradle.api.invocation.Gradle;
+import org.gradle.api.provider.Provider;
 
 public final class GradleUtils {
 	private GradleUtils() {
@@ -52,4 +53,18 @@ public final class GradleUtils {
 			}
 		});
 	}
+
+	public static Provider<Boolean> getBooleanPropertyProvider(Project project, String key) {
+		return project.getProviders().gradleProperty(key).map(string -> {
+			try {
+				return Boolean.parseBoolean(string);
+			} catch (final IllegalArgumentException ex) {
+				return false;
+			}
+		});
+	}
+
+	public static boolean getBooleanProperty(Project project, String key) {
+		return getBooleanPropertyProvider(project, key).getOrElse(false);
+	}
 }
diff --git a/src/test/groovy/net/fabricmc/loom/test/integration/FabricAPITest.groovy b/src/test/groovy/net/fabricmc/loom/test/integration/FabricAPITest.groovy
index 8f909d79..f5be694f 100644
--- a/src/test/groovy/net/fabricmc/loom/test/integration/FabricAPITest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/integration/FabricAPITest.groovy
@@ -49,6 +49,8 @@ class FabricAPITest extends Specification implements GradleProjectTestTrait {
 					patch: "fabric_api"
 			)
 
+			gradle.enableMultiProjectOptimisation()
+
 			// Set the version to something constant
 			gradle.buildGradle.text = gradle.buildGradle.text.replace('project.version + "+" + (ENV.GITHUB_RUN_NUMBER ? "" : "local-") + getBranch()', "\"$API_VERSION\"")
 
@@ -61,6 +63,7 @@ class FabricAPITest extends Specification implements GradleProjectTestTrait {
 			def serverResult = server.run()
 		then:
 			result.task(":build").outcome == SUCCESS
+			result.task(":prepareRemapJar").outcome == SUCCESS
 
 			new File(gradle.mavenLocalDir, "net/fabricmc/fabric-api/fabric-biome-api-v1/9.0.17/fabric-biome-api-v1-9.0.17.jar").exists()
 			new File(gradle.mavenLocalDir, "net/fabricmc/fabric-api/fabric-biome-api-v1/9.0.17/fabric-biome-api-v1-9.0.17-sources.jar").exists()
diff --git a/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy b/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy
index 2fdc5d4a..01d4e5b5 100644
--- a/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy
@@ -26,6 +26,7 @@ package net.fabricmc.loom.test.util
 
 import groovy.transform.Immutable
 import net.fabricmc.loom.test.LoomTestConstants
+import net.fabricmc.loom.util.Constants
 import net.fabricmc.loom.util.ZipUtils
 import org.apache.commons.io.FileUtils
 import org.gradle.testkit.runner.BuildResult
@@ -310,5 +311,9 @@ trait GradleProjectTestTrait {
                 }
             """
         }
+
+		void enableMultiProjectOptimisation() {
+			getGradleProperties() << "\n${Constants.Properties.MULTI_PROJECT_OPTIMISATION}=true"
+		}
     }
 }
\ No newline at end of file