diff --git a/compiler/fir/lightTree/build.gradle.kts b/compiler/fir/lightTree/build.gradle.kts
new file mode 100644
index 00000000000..ba0cf79460a
--- /dev/null
+++ b/compiler/fir/lightTree/build.gradle.kts
@@ -0,0 +1,32 @@
+plugins {
+    kotlin("jvm")
+    id("org.jetbrains.intellij") version "0.4.5"
+}
+
+group = "org.jetbrains.kotlin.fir"
+
+repositories {
+    mavenCentral()
+    mavenLocal()
+    maven { setUrl("https://www.jetbrains.com/intellij-repository/releases") }
+    maven { setUrl("https://jetbrains.bintray.com/intellij-third-party-dependencies") }
+}
+
+dependencies {
+    compile("com.jetbrains.intellij.java:java-psi-impl:183.5912.17")
+    compile("com.jetbrains.intellij.java:java-psi:183.5912.17")
+    
+    compile(project(":compiler:psi"))
+    
+    compile("junit", "junit", "4.4")
+    compile(projectTests(":compiler:fir:psi2fir"))
+}
+
+sourceSets {
+    "main" { projectDefault() }
+    "test" { projectDefault() }
+}
+
+projectTest {
+    workingDir = rootDir
+}
diff --git a/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/BaseTestCase.kt b/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/BaseTestCase.kt
new file mode 100644
index 00000000000..e02890f1d30
--- /dev/null
+++ b/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/BaseTestCase.kt
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.fir.lightTree
+
+import com.intellij.lang.impl.PsiBuilderFactoryImpl
+import com.intellij.psi.PsiManager
+import com.intellij.psi.impl.DebugUtil
+import com.intellij.psi.impl.PsiManagerEx
+import com.intellij.testFramework.LightVirtualFile
+import com.intellij.testFramework.TestDataPath
+import org.jetbrains.kotlin.idea.KotlinFileType
+import org.jetbrains.kotlin.parsing.KotlinParser
+import org.jetbrains.kotlin.parsing.KotlinParserDefinition
+import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.test.JUnit3RunnerWithInners
+import org.jetbrains.kotlin.test.testFramework.KtParsingTestCase
+import org.junit.runner.RunWith
+import java.io.File
+import kotlin.system.measureNanoTime
+
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+@TestDataPath("\$PROJECT_ROOT")
+@RunWith(JUnit3RunnerWithInners::class)
+class BaseTestCase: KtParsingTestCase(
+    "",
+    "kt",
+    KotlinParserDefinition()
+) {
+    fun test() {
+        val file = KtFile((PsiManager.getInstance(myProject) as PsiManagerEx).fileManager.createFileViewProvider(
+            LightVirtualFile(
+                "foo",
+                KotlinFileType.INSTANCE,
+                ""
+            ), true
+        ), false)
+        val parserDefinition = KotlinParserDefinition()
+        val lexer = parserDefinition.createLexer(myProject)
+        val builder = PsiBuilderFactoryImpl().createBuilder(parserDefinition, lexer, "class Base { val x: Int = 1 }")
+
+        val ktParsing = parserDefinition.createParser(myProject) as KotlinParser
+        ktParsing.parse(null, builder, file)
+
+        println(DebugUtil.lightTreeToString(builder.lightTree, false))
+        println(DebugUtil.nodeTreeToString(builder.treeBuilt, false))
+    }
+
+    fun testTotalKotlinWithGivenMode() {
+        val path = System.getProperty("user.dir")
+        val root = File(path)
+        var counter = 0
+        var time = 0L
+
+        val ktFile = KtFile((PsiManager.getInstance(myProject) as PsiManagerEx).fileManager.createFileViewProvider(
+            LightVirtualFile(
+                "foo",
+                KotlinFileType.INSTANCE,
+                ""
+            ), true
+        ), false)
+        val parserDefinition = KotlinParserDefinition()
+        val lexer = parserDefinition.createLexer(myProject)
+        val parser = parserDefinition.createParser(myProject) as KotlinParser
+
+        println("BASE PATH: $path")
+        for (file in root.walkTopDown()) {
+            if (file.isDirectory) continue
+            if (file.path.contains("testData") || file.path.contains("resources")) continue
+            if (file.extension != "kt") continue
+
+            time += measureNanoTime {
+                val builder = PsiBuilderFactoryImpl().createBuilder(parserDefinition, lexer, file.readText())
+                parser.parse(null, builder, ktFile)
+
+                DebugUtil.lightTreeToString(builder.lightTree, false)
+            }
+
+            counter++
+        }
+        println("SUCCESS!")
+        println("TIME PER FILE: ${(time / counter) * 1e-6} ms, COUNTER: $counter")
+
+    }
+}
+
diff --git a/settings.gradle b/settings.gradle
index 96df33ec4d9..e45928b4df7 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -39,6 +39,7 @@ include ":kotlin-build-common",
         ":compiler:fir:tree",
         ":compiler:fir:tree:visitors-generator",
         ":compiler:fir:psi2fir",
+        ":compiler:fir:lightTree",
         ":compiler:fir:fir2ir",
         ":compiler:fir:resolve",
         ":compiler:fir:java",