diff --git a/src/net/torvald/terrarum/audio/FFT.kt b/src/net/torvald/terrarum/audio/FFT.kt
index b195cafda..13bbca9bb 100644
--- a/src/net/torvald/terrarum/audio/FFT.kt
+++ b/src/net/torvald/terrarum/audio/FFT.kt
@@ -10,14 +10,14 @@ import org.bytedeco.javacpp.Loader
 import org.jtransforms.fft.FloatFFT_1D
 import java.util.concurrent.locks.ReentrantLock
 
+private val RE0 = 0
+private val IM0 = 1
 
-class ComplexArray(val reim: FloatArray) {
+private val RE1 = -1
+private val IM1 = 0
 
-    private val RE0 = 0
-    private val IM0 = 1
+@JvmInline value class ComplexArray(val reim: FloatArray) {
 
-    private val RE1 = -1
-    private val IM1 = 0
 
     val indices: IntProgression
         get() = 0 until size
@@ -40,6 +40,10 @@ class ComplexArray(val reim: FloatArray) {
 
         return ComplexArray(out)
     }
+
+    fun getReal(): FloatArray {
+        return FloatArray(size) { reim[it * 2] }
+    }
 }
 
 /**
@@ -138,7 +142,7 @@ object FFT: Disposable {
         val signal = signal0.reim
         val fft = FloatFFT_1D(signal0.size.toLong())
         fft.complexInverse(signal, true)
-        return FloatArray(signal0.size) { signal[it * 2] }
+        return signal0.getReal()
     }
 
     // org.apache.commons.math3.transform.FastFouriesTransformer.java:214
diff --git a/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt b/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
index 97117253d..9a784c16e 100644
--- a/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
+++ b/src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
@@ -2,6 +2,7 @@ package net.torvald.terrarum.audio
 
 import com.jme3.math.FastMath
 import com.jme3.math.FastMath.sin
+import net.torvald.terrarum.App.measureDebugTime
 import net.torvald.terrarum.audio.AudioMixer.SPEED_OF_SOUND
 import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.BUFFER_SIZE
 import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.SAMPLING_RATEF
@@ -375,9 +376,12 @@ class Convolv(ir: File, val gain: Float = 1f / 256f): TerrarumAudioFilter() {
         for (ch in outbuf.indices) {
             push(inbuf[ch].applyGain(gain), this.inbuf[ch])
 
-            val inputFFT = FFT.fft(this.inbuf[ch])
-            val Y = inputFFT * convFFT[ch]
-            val y = FFT.ifftAndGetReal(Y)
+            var inputFFT: ComplexArray? = null
+            var Y: ComplexArray? = null
+            lateinit var y: FloatArray
+            measureDebugTime("audio.convolve.inputFFT") { inputFFT = FFT.fft(this.inbuf[ch]) }
+            measureDebugTime("audio.convolve.multiply") { Y = inputFFT!! * convFFT[ch] }
+            measureDebugTime("audio.convolve.inputIFFT") { y = FFT.ifftAndGetReal(Y!!) }
             val u = y.takeLast(BLOCKSIZE).toFloatArray()