diff --git a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/BytecodeCompiler.kt b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/BytecodeCompiler.kt
index ae90beb..29d618a 100644
--- a/lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/BytecodeCompiler.kt
+++ b/lynglib/src/commonMain/kotlin/net/sergeych/lyng/bytecode/BytecodeCompiler.kt
@@ -3604,6 +3604,12 @@ class BytecodeCompiler(
                     }
                     SlotType.OBJ -> {
                         if (objOp == null) return null
+                        if (isExactNonNullSlotClassOrTemp(rhs.slot, ObjInt.type)) {
+                            val right = allocSlot()
+                            builder.emit(Opcode.UNBOX_INT_OBJ, rhs.slot, right)
+                            builder.emit(intOp, out, right, out)
+                            return CompiledValue(out, SlotType.INT)
+                        }
                         val leftObj = allocSlot()
                         builder.emit(Opcode.BOX_OBJ, out, leftObj)
                         updateSlotType(leftObj, SlotType.OBJ)
@@ -3629,6 +3635,12 @@ class BytecodeCompiler(
                     }
                     SlotType.OBJ -> {
                         if (objOp == null) return null
+                        if (isExactNonNullSlotClassOrTemp(rhs.slot, ObjReal.type)) {
+                            val right = allocSlot()
+                            builder.emit(Opcode.UNBOX_REAL_OBJ, rhs.slot, right)
+                            builder.emit(realOp, out, right, out)
+                            return CompiledValue(out, SlotType.REAL)
+                        }
                         val leftObj = allocSlot()
                         builder.emit(Opcode.BOX_OBJ, out, leftObj)
                         updateSlotType(leftObj, SlotType.OBJ)
diff --git a/notes/fast_ops_optimizations_plan.md b/notes/fast_ops_optimizations_plan.md
index 05a7aa3..77454be 100644
--- a/notes/fast_ops_optimizations_plan.md
+++ b/notes/fast_ops_optimizations_plan.md
@@ -19,5 +19,6 @@ Candidates (not started)
 5) String ops (done)
    - Mark GET_INDEX results as stable only for closed ObjString elements to enable fast compares.
    - MixedCompareBenchmarkTest: 247 ms -> 240 ms.
-6) Box/unbox audit
-   - Identify remaining BOX_OBJ / OBJ_TO_* in inner loops and eliminate when safe.
+6) Box/unbox audit (done)
+   - Unbox ObjInt/ObjReal in assign-op when target is INT/REAL to avoid boxing + obj ops.
+   - MixedCompareBenchmarkTest: 240 ms -> 234 ms.