diff --git a/src/main/java/net/fabricmc/loom/configuration/processors/MinecraftJarProcessorManager.java b/src/main/java/net/fabricmc/loom/configuration/processors/MinecraftJarProcessorManager.java
index e0d114df..39b63559 100644
--- a/src/main/java/net/fabricmc/loom/configuration/processors/MinecraftJarProcessorManager.java
+++ b/src/main/java/net/fabricmc/loom/configuration/processors/MinecraftJarProcessorManager.java
@@ -1,7 +1,7 @@
 /*
  * This file is part of fabric-loom, licensed under the MIT License (MIT).
  *
- * Copyright (c) 2022 FabricMC
+ * Copyright (c) 2022-2023 FabricMC
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -25,7 +25,6 @@
 package net.fabricmc.loom.configuration.processors;
 
 import java.io.IOException;
-import java.io.UncheckedIOException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -47,11 +46,10 @@ import net.fabricmc.loom.api.processor.MappingProcessorContext;
 import net.fabricmc.loom.api.processor.MinecraftJarProcessor;
 import net.fabricmc.loom.api.processor.ProcessorContext;
 import net.fabricmc.loom.api.processor.SpecContext;
-import net.fabricmc.loom.util.ZipUtils;
+import net.fabricmc.loom.util.Checksum;
 import net.fabricmc.mappingio.tree.MemoryMappingTree;
 
 public final class MinecraftJarProcessorManager {
-	private static final String CACHE_VALUE_FILE_PATH = "META-INF/Loom-Jar-Processor-Cache";
 	private static final Logger LOGGER = LoggerFactory.getLogger(MinecraftJarProcessorManager.class);
 
 	private final List<ProcessorEntry<?>> jarProcessors;
@@ -102,17 +100,22 @@ public final class MinecraftJarProcessorManager {
 	}
 
 	private String getDebugString() {
-		final StringJoiner sj = new StringJoiner("\n");
+		final var sj = new StringJoiner("\n");
 
 		for (ProcessorEntry<?> jarProcessor : jarProcessors) {
 			sj.add(jarProcessor.name() + ":");
 			sj.add("\tHash: " + jarProcessor.hashCode());
-			sj.add("\tStr: " + jarProcessor.toString());
+			sj.add("\tStr: " + jarProcessor.cacheValue());
 		}
 
 		return sj.toString();
 	}
 
+	public String getJarHash() {
+		//fabric-loom:mod-javadoc:-1289977000
+		return Checksum.sha1Hex(getCacheValue().getBytes(StandardCharsets.UTF_8)).substring(0, 10);
+	}
+
 	public boolean requiresProcessingJar(Path jar) {
 		Objects.requireNonNull(jar);
 
@@ -121,32 +124,7 @@ public final class MinecraftJarProcessorManager {
 			return true;
 		}
 
-		byte[] existingCache;
-
-		try {
-			existingCache = ZipUtils.unpackNullable(jar, CACHE_VALUE_FILE_PATH);
-		} catch (IOException e) {
-			throw new UncheckedIOException("Failed to unpack jar: " + jar, e);
-		}
-
-		if (existingCache == null) {
-			LOGGER.info("{} does not contain a processor cache value, regenerating", jar);
-			return true;
-		}
-
-		final String existingCacheValue = new String(existingCache, StandardCharsets.UTF_8);
-		final String expectedCacheValue = getCacheValue();
-		final boolean matches = existingCacheValue.equals(expectedCacheValue);
-
-		if (!matches) {
-			LOGGER.info("{} has an invalid cache, got {} expected {}", jar, existingCacheValue, expectedCacheValue);
-
-			if (LOGGER.isInfoEnabled()) {
-				LOGGER.info("Expected state: {}", getDebugString());
-			}
-		}
-
-		return !matches;
+		return false;
 	}
 
 	public void processJar(Path jar, ProcessorContext context) throws IOException {
@@ -157,8 +135,6 @@ public final class MinecraftJarProcessorManager {
 				throw new IOException("Failed to process jar when running jar processor: %s".formatted(entry.name()), e);
 			}
 		}
-
-		ZipUtils.add(jar, CACHE_VALUE_FILE_PATH, getCacheValue());
 	}
 
 	public boolean processMappings(MemoryMappingTree mappings, MappingProcessorContext context) {
diff --git a/src/main/java/net/fabricmc/loom/configuration/processors/ModJavadocProcessor.java b/src/main/java/net/fabricmc/loom/configuration/processors/ModJavadocProcessor.java
index 7a773e78..781ca37f 100644
--- a/src/main/java/net/fabricmc/loom/configuration/processors/ModJavadocProcessor.java
+++ b/src/main/java/net/fabricmc/loom/configuration/processors/ModJavadocProcessor.java
@@ -32,7 +32,9 @@ import java.io.UncheckedIOException;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.List;
+import java.util.Objects;
 
 import javax.inject.Inject;
 
@@ -45,6 +47,7 @@ import net.fabricmc.loom.api.mappings.layered.MappingsNamespace;
 import net.fabricmc.loom.api.processor.MinecraftJarProcessor;
 import net.fabricmc.loom.api.processor.ProcessorContext;
 import net.fabricmc.loom.api.processor.SpecContext;
+import net.fabricmc.loom.util.Checksum;
 import net.fabricmc.loom.util.Constants;
 import net.fabricmc.loom.util.fmj.FabricModJson;
 import net.fabricmc.mappingio.MappingReader;
@@ -82,6 +85,7 @@ public abstract class ModJavadocProcessor implements MinecraftJarProcessor<ModJa
 			return null;
 		}
 
+		javadocs.sort(Comparator.comparing(ModJavadoc::modId));
 		return new Spec(Collections.unmodifiableList(javadocs));
 	}
 
@@ -104,7 +108,7 @@ public abstract class ModJavadocProcessor implements MinecraftJarProcessor<ModJa
 		};
 	}
 
-	public record ModJavadoc(String modId, MemoryMappingTree mappingTree) {
+	public record ModJavadoc(String modId, MemoryMappingTree mappingTree, String mappingsHash) {
 		@Nullable
 		public static ModJavadoc create(FabricModJson fabricModJson) {
 			final String modId = fabricModJson.getId();
@@ -116,9 +120,11 @@ public abstract class ModJavadocProcessor implements MinecraftJarProcessor<ModJa
 
 			final String javaDocPath = customElement.getAsString();
 			final MemoryMappingTree mappings = new MemoryMappingTree();
+			final String mappingsHash;
 
 			try {
 				final byte[] data = fabricModJson.getSource().read(javaDocPath);
+				mappingsHash = Checksum.sha1Hex(data);
 
 				try (Reader reader = new InputStreamReader(new ByteArrayInputStream(data))) {
 					MappingReader.read(reader, mappings);
@@ -135,7 +141,7 @@ public abstract class ModJavadocProcessor implements MinecraftJarProcessor<ModJa
 				throw new IllegalStateException("Javadoc provided by mod (%s) must not contain any dst names".formatted(modId));
 			}
 
-			return new ModJavadoc(modId, mappings);
+			return new ModJavadoc(modId, mappings, mappingsHash);
 		}
 
 		public void apply(MemoryMappingTree target) {
@@ -196,5 +202,16 @@ public abstract class ModJavadocProcessor implements MinecraftJarProcessor<ModJa
 			targetComment += sourceComment;
 			target.setComment(targetComment);
 		}
+
+		// Must override as not to include MemoryMappingTree
+		@Override
+		public int hashCode() {
+			return Objects.hash(modId, mappingsHash);
+		}
+
+		@Override
+		public String toString() {
+			return "ModJavadoc{modId='%s', mappingsHash='%s'}".formatted(modId, mappingsHash);
+		}
 	}
 }
diff --git a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/ProcessedNamedMinecraftProvider.java b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/ProcessedNamedMinecraftProvider.java
index d956079f..d7dc8bb0 100644
--- a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/ProcessedNamedMinecraftProvider.java
+++ b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/ProcessedNamedMinecraftProvider.java
@@ -1,7 +1,7 @@
 /*
  * This file is part of fabric-loom, licensed under the MIT License (MIT).
  *
- * Copyright (c) 2021-2022 FabricMC
+ * Copyright (c) 2021-2023 FabricMC
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -28,14 +28,11 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.List;
-import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
-import org.gradle.api.Project;
-
 import net.fabricmc.loom.configuration.ConfigContext;
 import net.fabricmc.loom.configuration.mods.dependency.LocalMavenHelper;
 import net.fabricmc.loom.configuration.processors.MinecraftJarProcessorManager;
@@ -129,14 +126,8 @@ public abstract class ProcessedNamedMinecraftProvider<M extends MinecraftProvide
 
 	@Override
 	protected String getName(String name) {
-		final Project project = getProject();
-
-		if (project.getRootProject() == project) {
-			return "minecraft-%s-project-root".formatted(name).toLowerCase(Locale.ROOT);
-		}
-
-		final String projectPath = project.getPath().replace(':', '@');
-		return "minecraft-%s-project-%s".formatted(name, projectPath).toLowerCase(Locale.ROOT);
+		// Hash the cache value so that we don't have to process the same JAR multiple times for many projects
+		return "minecraft-%s-%s".formatted(name, jarProcessorManager.getJarHash());
 	}
 
 	@Override
diff --git a/src/main/java/net/fabricmc/loom/util/Checksum.java b/src/main/java/net/fabricmc/loom/util/Checksum.java
index 5337b867..d90493fd 100644
--- a/src/main/java/net/fabricmc/loom/util/Checksum.java
+++ b/src/main/java/net/fabricmc/loom/util/Checksum.java
@@ -33,6 +33,7 @@ import java.nio.file.Path;
 import com.google.common.hash.HashCode;
 import com.google.common.hash.Hashing;
 import com.google.common.io.BaseEncoding;
+import com.google.common.io.ByteSource;
 import com.google.common.io.Files;
 import org.gradle.api.Project;
 import org.gradle.api.logging.Logger;
@@ -71,6 +72,15 @@ public class Checksum {
 		return toHex(hash.asBytes());
 	}
 
+	public static String sha1Hex(byte[] input) {
+		try {
+			HashCode hash = ByteSource.wrap(input).hash(Hashing.sha1());
+			return toHex(hash.asBytes());
+		} catch (IOException e) {
+			throw new UncheckedIOException("Failed to hash", e);
+		}
+	}
+
 	public static String truncatedSha256(File file) {
 		try {
 			HashCode hash = Files.asByteSource(file).hash(Hashing.sha256());
diff --git a/src/test/groovy/net/fabricmc/loom/test/unit/processor/MinecraftJarProcessorManagerTest.groovy b/src/test/groovy/net/fabricmc/loom/test/unit/processor/MinecraftJarProcessorManagerTest.groovy
index 3a60fa66..ed10906e 100644
--- a/src/test/groovy/net/fabricmc/loom/test/unit/processor/MinecraftJarProcessorManagerTest.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/unit/processor/MinecraftJarProcessorManagerTest.groovy
@@ -26,46 +26,37 @@ package net.fabricmc.loom.test.unit.processor
 
 import spock.lang.Specification
 
-import net.fabricmc.loom.api.processor.ProcessorContext
 import net.fabricmc.loom.api.processor.SpecContext
 import net.fabricmc.loom.configuration.processors.MinecraftJarProcessorManager
 import net.fabricmc.loom.test.util.processor.TestMinecraftJarProcessor
 
-import static net.fabricmc.loom.test.util.ZipTestUtils.createZip
-
 class MinecraftJarProcessorManagerTest extends Specification {
-	def "Does not require re-processing"() {
-		given:
+	def "Cache value matches"() {
+		when:
 		def specContext = Mock(SpecContext)
-		def processorContext = Mock(ProcessorContext)
 
 		def processor1 = new TestMinecraftJarProcessor(input: "Test1")
 		def processor2 = new TestMinecraftJarProcessor(input: "Test2")
-		def manager = MinecraftJarProcessorManager.create([processor1, processor2], specContext)
-
-		when:
-		def jar = createZip(["fabric.mod.json": "{}"])
-		manager.processJar(jar, processorContext)
+		def manager1 = MinecraftJarProcessorManager.create([processor1, processor2], specContext)
+		def manager2 = MinecraftJarProcessorManager.create([processor1, processor2], specContext)
 
 		then:
-		!manager.requiresProcessingJar(jar)
+		manager1.jarHash == manager2.jarHash
+		manager1.jarHash == "eb6faafa72"
 	}
 
-	def "Requires re-processing"() {
-		given:
+	def "Cache value does not match"() {
+		when:
 		def specContext = Mock(SpecContext)
-		def processorContext = Mock(ProcessorContext)
 
 		def processor1 = new TestMinecraftJarProcessor(input: "Test1")
 		def processor2 = new TestMinecraftJarProcessor(input: "Test2")
 		def manager1 = MinecraftJarProcessorManager.create([processor1], specContext)
 		def manager2 = MinecraftJarProcessorManager.create([processor1, processor2], specContext)
 
-		when:
-		def jar = createZip(["fabric.mod.json": "{}"])
-		manager1.processJar(jar, processorContext)
-
 		then:
-		manager2.requiresProcessingJar(jar)
+		manager1.jarHash != manager2.jarHash
+		manager1.jarHash == "a714eb2de6"
+		manager2.jarHash == "eb6faafa72"
 	}
 }
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 a741f095..11e2a707 100644
--- a/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy
+++ b/src/test/groovy/net/fabricmc/loom/test/util/GradleProjectTestTrait.groovy
@@ -24,6 +24,7 @@
 
 package net.fabricmc.loom.test.util
 
+import groovy.io.FileType
 import groovy.transform.Immutable
 import org.apache.commons.io.FileUtils
 import org.gradle.testkit.runner.BuildResult
@@ -241,7 +242,20 @@ trait GradleProjectTestTrait {
 		}
 
 		File getGeneratedLocalSources(String mappings) {
-			return new File(getProjectDir(), ".gradle/loom-cache/minecraftMaven/net/minecraft/minecraft-merged-project-root/${mappings}/minecraft-merged-project-root-${mappings}-sources.jar")
+			File file
+			getProjectDir().traverse(type: FileType.FILES) {
+				if (it.name.startsWith("minecraft-merged-")
+						&& it.name.contains(mappings)
+						&& it.name.endsWith("-sources.jar")) {
+					file = it
+				}
+			}
+
+			if (file == null) {
+				throw new FileNotFoundException()
+			}
+
+			return file
 		}
 
 		void buildSrc(String name) {