diff --git a/compiler/fir/lightTree/build.gradle.kts b/compiler/fir/lightTree/build.gradle.kts
index f985d0d6b59..68838541905 100644
--- a/compiler/fir/lightTree/build.gradle.kts
+++ b/compiler/fir/lightTree/build.gradle.kts
@@ -90,5 +90,6 @@ val jmhExec by tasks.creating(JavaExec::class) {
 
     workingDir = rootDir
     systemProperty("idea.home.path", project.intellij.localPath)
+    systemProperty("idea.max.intellisense.filesize", 5000 * 1024)
     configurations.plusAssign(project.configurations["compile"])
 }
\ No newline at end of file
diff --git a/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/AbstractKotlinBenchmark.kt b/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/AbstractKotlinBenchmark.kt
new file mode 100644
index 00000000000..e65f029eda3
--- /dev/null
+++ b/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/AbstractKotlinBenchmark.kt
@@ -0,0 +1,66 @@
+/*
+ * 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.benchmark.createdFiles
+
+import org.jetbrains.kotlin.fir.lightTree.benchmark.*
+import org.openjdk.jmh.annotations.*
+import java.io.File
+import java.util.concurrent.TimeUnit
+
+@Warmup(iterations = 10, batchSize = 1, timeUnit = TimeUnit.NANOSECONDS)
+@Measurement(iterations = 10, batchSize = 1, timeUnit = TimeUnit.NANOSECONDS)
+@State(Scope.Benchmark)
+abstract class AbstractKotlinBenchmark : AbstractBenchmark() {
+    abstract val generator: TreeGenerator
+
+    @Param(
+        /* CLASSES */
+        "1Class", "10Classes", "100Classes", "1000Classes", "10_000Classes", "100_000Classes",
+        "1Cin1C", "10Cin1C", "100Cin1C", "1000Cin1C", "10_000Cin1C", "100_000Cin1C",
+        "1Cin10C", "10Cin10C", "100Cin10C", "1000Cin10C", "10_000Cin10C",
+        "1Cin100C", "10Cin100C", "100Cin100C", "1000Cin100C",
+        "1Cin1000C", "10Cin1000C", "100Cin1000C",
+        "1Cin10_000C", "10Cin10_000C", "1Cin100_000C",
+        /* FUNCTIONS */
+        "1Fun", "10Fun", "100Fun", "1000Fun", "10_000Fun", "100_000Fun",
+        "1Fin1C", "1Fin10C", "1Fin100C", "1Fin1000C", "1Fin10_000C", "1Fin100_000C",
+        "10Fin1C", "10Fin10C", "10Fin100C", "10Fin1000C", "10Fin10_000C",
+        "100Fin1C", "100Fin10C", "100Fin100C", "100Fin1000C",
+        /* PROPERTIES */
+        "1Var", "10Var", "100Var", "1000Var", "10_000Var", "100_000Var",
+        "1Vin1C", "1Vin10C", "1Vin100C", "1Vin1000C", "1Vin10_000C", "1Vin100_000C",
+        "10Vin1C", "10Vin10C", "10Vin100C", "10Vin1000C", "10Vin10_000C",
+        "100Vin1C", "100Vin10C", "100Vin100C", "100Vin1000C"
+    )
+    var methodName: String = ""
+
+    private var text: String = ""
+    private var file: File = File("$methodName.kt")
+
+    @Setup
+    fun setUp() {
+        generator.setUp()
+
+        val testMethod = TestCases::class.java.getMethod(methodName)
+        text = testMethod.invoke(TestCases()) as String
+    }
+
+    @TearDown
+    fun tearDown() {
+        generator.tearDown()
+    }
+
+    @Benchmark
+    fun testCreatedFiles() {
+        generator.generateFir(text, file)
+    }
+}
+
+open class LightTree2FirKotlinBenchmark(override val generator: TreeGenerator = LightTree2FirGenerator()) :
+    AbstractKotlinBenchmark()
+
+open class Psi2FirKotlinBenchmark(override val generator: TreeGenerator = Psi2FirGenerator()) :
+    AbstractKotlinBenchmark()
\ No newline at end of file
diff --git a/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/TestCases.kt b/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/TestCases.kt
new file mode 100644
index 00000000000..bf33eb8b27e
--- /dev/null
+++ b/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/TestCases.kt
@@ -0,0 +1,542 @@
+/*
+ * 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.benchmark.createdFiles
+
+class TestCases {
+    /* CLASSES */
+    fun `1Class`(): String {
+        return TestCasesGenerator().generateData({ createClass(1) }).getText()
+    }
+
+    fun `10Classes`(): String {
+        return TestCasesGenerator().generateData({ createClass(10) }).getText()
+    }
+
+    fun `100Classes`(): String {
+        return TestCasesGenerator().generateData({ createClass(100) }).getText()
+    }
+
+    fun `1000Classes`(): String {
+        return TestCasesGenerator().generateData({ createClass(1000) }).getText()
+    }
+
+    fun `10_000Classes`(): String {
+        return TestCasesGenerator().generateData({ createClass(10000) }).getText()
+    }
+
+    fun `100_000Classes`(): String {
+        return TestCasesGenerator().generateData({ createClass(100000) }).getText()
+    }
+
+    fun `1Cin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createClass(1)
+                })
+            }).getText()
+    }
+
+    fun `10Cin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createClass(10)
+                })
+            }).getText()
+    }
+
+    fun `100Cin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createClass(100)
+                })
+            }).getText()
+    }
+
+    fun `1000Cin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createClass(1000)
+                })
+            }).getText()
+    }
+
+    fun `10_000Cin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createClass(10_000)
+                })
+            }).getText()
+    }
+
+    fun `100_000Cin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createClass(100_000)
+                })
+            }).getText()
+    }
+
+    fun `1Cin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createClass(1)
+                })
+            }).getText()
+    }
+
+    fun `10Cin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createClass(10)
+                })
+            }).getText()
+    }
+
+    fun `100Cin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createClass(100)
+                })
+            }).getText()
+    }
+
+    fun `1000Cin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createClass(1000)
+                })
+            }).getText()
+    }
+
+    fun `10_000Cin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createClass(10_000)
+                })
+            }).getText()
+    }
+
+    fun `1Cin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createClass(1)
+                })
+            }).getText()
+    }
+
+    fun `10Cin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createClass(10)
+                })
+            }).getText()
+    }
+
+    fun `100Cin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createClass(100)
+                })
+            }).getText()
+    }
+
+    fun `1000Cin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createClass(1000)
+                })
+            }).getText()
+    }
+
+    fun `1Cin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createClass(1)
+                })
+            }).getText()
+    }
+
+    fun `10Cin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createClass(10)
+                })
+            }).getText()
+    }
+
+    fun `100Cin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createClass(100)
+                })
+            }).getText()
+    }
+
+    fun `1Cin10_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10_000, {
+                    createClass(1)
+                })
+            }).getText()
+    }
+
+    fun `10Cin10_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10_000, {
+                    createClass(10)
+                })
+            }).getText()
+    }
+
+    fun `1Cin100_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100_000, {
+                    createClass(1)
+                })
+            }).getText()
+    }
+
+    /* FUNCTIONS */
+    fun `1Fun`(): String {
+        return TestCasesGenerator().generateData({ createFun(1) }).getText()
+    }
+
+    fun `10Fun`(): String {
+        return TestCasesGenerator().generateData({ createFun(10) }).getText()
+    }
+
+    fun `100Fun`(): String {
+        return TestCasesGenerator().generateData({ createFun(100) }).getText()
+    }
+
+    fun `1000Fun`(): String {
+        return TestCasesGenerator().generateData({ createFun(1000) }).getText()
+    }
+
+    fun `10_000Fun`(): String {
+        return TestCasesGenerator().generateData({ createFun(10000) }).getText()
+    }
+
+    fun `100_000Fun`(): String {
+        return TestCasesGenerator().generateData({ createFun(100000) }).getText()
+    }
+
+    fun `1Fin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createFun(1)
+                })
+            }).getText()
+    }
+
+    fun `1Fin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createFun(1)
+                })
+            }).getText()
+    }
+
+    fun `1Fin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createFun(1)
+                })
+            }).getText()
+    }
+
+    fun `1Fin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createFun(1)
+                })
+            }).getText()
+    }
+
+    fun `1Fin10_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10_000, {
+                    createFun(1)
+                })
+            }).getText()
+    }
+
+    fun `1Fin100_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100_000, {
+                    createFun(1)
+                })
+            }).getText()
+    }
+
+    fun `10Fin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createFun(10)
+                })
+            }).getText()
+    }
+
+    fun `10Fin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createFun(10)
+                })
+            }).getText()
+    }
+
+    fun `10Fin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createFun(10)
+                })
+            }).getText()
+    }
+
+    fun `10Fin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createFun(10)
+                })
+            }).getText()
+    }
+
+    fun `10Fin10_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10_000, {
+                    createFun(10)
+                })
+            }).getText()
+    }
+
+    fun `100Fin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createFun(100)
+                })
+            }).getText()
+    }
+
+    fun `100Fin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createFun(100)
+                })
+            }).getText()
+    }
+
+    fun `100Fin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createFun(100)
+                })
+            }).getText()
+    }
+
+    fun `100Fin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createFun(100)
+                })
+            }).getText()
+    }
+
+    /* PROPERTIES */
+    fun `1Var`(): String {
+        return TestCasesGenerator().generateData({ createProperty(1) }).getText()
+    }
+
+    fun `10Var`(): String {
+        return TestCasesGenerator().generateData({ createProperty(10) }).getText()
+    }
+
+    fun `100Var`(): String {
+        return TestCasesGenerator().generateData({ createProperty(100) }).getText()
+    }
+
+    fun `1000Var`(): String {
+        return TestCasesGenerator().generateData({ createProperty(1000) }).getText()
+    }
+
+    fun `10_000Var`(): String {
+        return TestCasesGenerator().generateData({ createProperty(10000) }).getText()
+    }
+
+    fun `100_000Var`(): String {
+        return TestCasesGenerator().generateData({ createProperty(100000) }).getText()
+    }
+
+    fun `1Vin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createProperty(1)
+                })
+            }).getText()
+    }
+
+    fun `1Vin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createProperty(1)
+                })
+            }).getText()
+    }
+
+    fun `1Vin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createProperty(1)
+                })
+            }).getText()
+    }
+
+    fun `1Vin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createProperty(1)
+                })
+            }).getText()
+    }
+
+    fun `1Vin10_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10_000, {
+                    createProperty(1)
+                })
+            }).getText()
+    }
+
+    fun `1Vin100_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100_000, {
+                    createProperty(1)
+                })
+            }).getText()
+    }
+
+    fun `10Vin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createProperty(10)
+                })
+            }).getText()
+    }
+
+    fun `10Vin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createProperty(10)
+                })
+            }).getText()
+    }
+
+    fun `10Vin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createProperty(10)
+                })
+            }).getText()
+    }
+
+    fun `10Vin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createProperty(10)
+                })
+            }).getText()
+    }
+
+    fun `10Vin10_000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10_000, {
+                    createProperty(10)
+                })
+            }).getText()
+    }
+
+    fun `100Vin1C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1, {
+                    createProperty(100)
+                })
+            }).getText()
+    }
+
+    fun `100Vin10C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(10, {
+                    createProperty(100)
+                })
+            }).getText()
+    }
+
+    fun `100Vin100C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(100, {
+                    createProperty(100)
+                })
+            }).getText()
+    }
+
+    fun `100Vin1000C`(): String {
+        return TestCasesGenerator().generateData(
+            {
+                createClass(1000, {
+                    createProperty(100)
+                })
+            }).getText()
+    }
+}
\ No newline at end of file
diff --git a/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/TestCasesGenerator.kt b/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/TestCasesGenerator.kt
new file mode 100644
index 00000000000..56b99c21966
--- /dev/null
+++ b/compiler/fir/lightTree/tests/org/jetbrains/kotlin/fir/lightTree/benchmark/createdFiles/TestCasesGenerator.kt
@@ -0,0 +1,99 @@
+/*
+ * 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.benchmark.createdFiles
+
+import org.jetbrains.kotlin.utils.Printer
+import kotlin.random.Random
+
+class TestCasesGenerator {
+    private val charPool: List<Char> = ('a'..'z') + ('A'..'Z')
+    private val types = listOf("Int", "Double", "Boolean", "String")
+
+    private val builder = StringBuilder()
+    private val printer: Printer
+
+    init {
+        printer = Printer(builder, "    ")
+    }
+
+    fun generateData(vararg pipeline: TestCasesGenerator.() -> Unit): TestCasesGenerator {
+        printer.apply {
+            pipeline.forEach { it() }
+        }
+        return this
+    }
+
+    fun createClass(count: Int, vararg pipeline: TestCasesGenerator.() -> Unit) {
+        for (i in 1..count) {
+            printer.println("class ${randomString(Random.nextLong(5, 15))} {")
+            printer.pushIndent()
+            printer.apply {
+                pipeline.forEach { it() }
+            }
+            printer.popIndent()
+            printer.println("}")
+        }
+    }
+
+    fun createFun(count: Int, vararg pipeline: TestCasesGenerator.() -> Unit) {
+        for (i in 1..count) {
+            printer.println("fun ${randomString(Random.nextLong(5, 15))}() {")
+            printer.pushIndent()
+            printer.apply {
+                pipeline.forEach { it() }
+            }
+            printer.popIndent()
+            printer.println("}")
+        }
+    }
+
+    fun createProperty(count: Int) {
+        for (i in 1..count) {
+            val typeAndValue = getRandomTypeAndValue()
+            printer.println(
+                "val ${randomString(Random.nextLong(5, 15))}: " +
+                        "${typeAndValue.first} = ${typeAndValue.second} \n"
+            )
+        }
+    }
+
+    private fun randomString(length: Long): String {
+        return (1..length)
+            .map { Random.nextInt(0, charPool.size) }
+            .map(charPool::get)
+            .joinToString("")
+    }
+
+    private fun getRandomTypeAndValue(): Pair<String, String> {
+        val type = types[Random.nextInt(0, types.size)]
+        return when (type) {
+            "Int" -> Pair(type, Random.nextInt().toString())
+            "Double" -> Pair(type, Random.nextDouble().toString())
+            "Boolean" -> Pair(type, Random.nextBoolean().toString())
+            "String" -> Pair(type, randomString(Random.nextLong(5, 15)))
+            else -> throw UnsupportedOperationException("Unsupported type")
+        }
+    }
+
+    fun getText(): String {
+        return builder.toString()
+    }
+}
+
+fun main() {
+    TestCasesGenerator().generateData(
+        {
+            createClass(10,
+                        {
+                            createClass(100,
+                                        {
+                                            createClass(100)
+                                        })
+                        })
+        }
+    )
+}
+