diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/WorkersIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/WorkersIT.kt
index fdb32811326..f1d26a6b50f 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/WorkersIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/WorkersIT.kt
@@ -5,23 +5,45 @@
 
 package org.jetbrains.kotlin.gradle
 
+import org.jetbrains.kotlin.gradle.plugin.JsMode
+import org.jetbrains.kotlin.gradle.util.jsMode
 import org.junit.Test
 
 class WorkersIT : BaseGradleIT() {
     @Test
     fun testParallelTasks() {
-        parallelTasksImpl(isParallel = true)
+        parallelTasksImpl(
+            isParallel = true,
+            jsIr = true
+        )
+        parallelTasksImpl(
+            isParallel = true,
+            jsIr = false
+        )
     }
 
     @Test
     fun testNoParallelTasks() {
-        parallelTasksImpl(isParallel = false)
+        parallelTasksImpl(
+            isParallel = false,
+            jsIr = true
+        )
+        parallelTasksImpl(
+            isParallel = false,
+            jsIr = false
+        )
     }
 
-    private fun parallelTasksImpl(isParallel: Boolean) =
+    private fun parallelTasksImpl(
+        isParallel: Boolean,
+        jsIr: Boolean
+    ) =
         with(Project("new-mpp-parallel")) {
             val options = defaultBuildOptions().copy(parallelTasksInProject = isParallel, withDaemon = false)
             val traceLoading = "-Dorg.jetbrains.kotlin.compilerRunner.GradleKotlinCompilerWork.trace.loading=true"
+            if (!jsIr) {
+                gradleProperties().appendText(jsMode(JsMode.LEGACY))
+            }
             build("assemble", traceLoading, options = options) {
                 assertSuccessful()
                 val tasks = arrayOf(":compileKotlinMetadata", ":compileKotlinJvm", ":compileKotlinJs")
@@ -33,7 +55,8 @@ class WorkersIT : BaseGradleIT() {
                 val expectedKotlinOutputFiles = listOf(
                     kotlinClassesDir(sourceSet = "metadata/main") + "common/A.kotlin_metadata",
                     kotlinClassesDir(sourceSet = "jvm/main") + "common/A.class",
-                    kotlinClassesDir(sourceSet = "js/main") + "new-mpp-parallel.js"
+                    kotlinClassesDir(sourceSet = "js/main") +
+                            if (jsIr) "manifest" else "new-mpp-parallel.js"
                 )
                 expectedKotlinOutputFiles.forEach { assertFileExists(it) }
                 assertSubstringCount("Loaded GradleKotlinCompilerWork", 1)
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt
index 3f277be0c62..10928594e69 100755
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt
@@ -355,7 +355,6 @@ internal class KotlinJsIrSourceSetProcessor(
         return tasksProvider.registerKotlinJsIrTask(
             project,
             taskName,
-            KotlinJsIrLink::class.java,
             kotlinCompilation
         ) { task ->
             task.type = type
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/Kotlin2JsCompileWithWorkers.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/Kotlin2JsCompileWithWorkers.kt
new file mode 100644
index 00000000000..3eebb6e5a55
--- /dev/null
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/Kotlin2JsCompileWithWorkers.kt
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.targets.js.ir
+
+import org.gradle.api.tasks.CacheableTask
+import org.gradle.workers.WorkerExecutor
+import org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers
+import javax.inject.Inject
+
+@CacheableTask
+internal open class KotlinJsIrLinkWithWorkers
+@Inject
+constructor(
+    private val workerExecutor: WorkerExecutor
+) : KotlinJsIrLink() {
+    override fun compilerRunner() = GradleCompilerRunnerWithWorkers(this, workerExecutor)
+}
\ No newline at end of file
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrLink.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrLink.kt
index 836d7634bea..dbcb6f8220d 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrLink.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrLink.kt
@@ -16,6 +16,7 @@ import org.jetbrains.kotlin.gradle.tasks.Kotlin2JsCompile
 import org.jetbrains.kotlin.gradle.utils.newFileProperty
 import java.io.File
 
+@CacheableTask
 open class KotlinJsIrLink : Kotlin2JsCompile() {
     @Input
     lateinit var type: KotlinJsIrType
@@ -25,6 +26,7 @@ open class KotlinJsIrLink : Kotlin2JsCompile() {
 
     @get:SkipWhenEmpty
     @get:InputDirectory
+    @get:PathSensitive(PathSensitivity.RELATIVE)
     val entryModule: File
         get() = File(
             (taskData.compilation as KotlinJsIrCompilation)
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/TasksProvider.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/TasksProvider.kt
index 7e157fc690f..b63f9769d76 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/TasksProvider.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/tasks/TasksProvider.kt
@@ -25,6 +25,8 @@ import org.jetbrains.kotlin.gradle.plugin.mapKotlinTaskProperties
 import org.jetbrains.kotlin.gradle.plugin.mpp.AbstractKotlinCompilation
 import org.jetbrains.kotlin.gradle.plugin.runOnceAfterEvaluated
 import org.jetbrains.kotlin.gradle.plugin.sources.applyLanguageSettingsToKotlinOptions
+import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrLink
+import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrLinkWithWorkers
 
 /**
  * Registers the task with [name] and [type] and initialization script [body]
@@ -100,14 +102,14 @@ internal open class KotlinTasksProvider(val targetName: String) {
         return result
     }
 
-    fun <T : Kotlin2JsCompile> registerKotlinJsIrTask(
+    fun registerKotlinJsIrTask(
         project: Project,
         name: String,
-        taskClass: Class<out T>,
         compilation: AbstractKotlinCompilation<*>,
-        configureAction: (T) -> Unit
-    ): TaskProvider<out T> {
+        configureAction: (KotlinJsIrLink) -> Unit
+    ): TaskProvider<out KotlinJsIrLink> {
         val properties = PropertiesProvider(project)
+        val taskClass = taskOrWorkersTask<KotlinJsIrLink, KotlinJsIrLinkWithWorkers>(properties)
         val result = project.registerTask(name, taskClass) {
             configureAction(it)
         }