diff --git a/src/asmc/compile.go b/src/asmc/compile.go
index dfcddca..41169c9 100644
--- a/src/asmc/compile.go
+++ b/src/asmc/compile.go
@@ -121,7 +121,7 @@ func (c *compiler) compile(x asm.Instruction) {
 	case asm.PUSH:
 		switch operands := x.Data.(type) {
 		case *asm.Number:
-			c.code = x86.PushNumber(c.code, operands.Number)
+			c.code = x86.PushNumber(c.code, int32(operands.Number))
 		case *asm.Register:
 			c.code = x86.PushRegister(c.code, operands.Register)
 		}
diff --git a/src/core/CallExtern.go b/src/core/CallExtern.go
index 588761f..241c15a 100644
--- a/src/core/CallExtern.go
+++ b/src/core/CallExtern.go
@@ -1,7 +1,6 @@
 package core
 
 import (
-	"fmt"
 	"slices"
 
 	"git.urbach.dev/cli/q/src/asm"
@@ -37,7 +36,7 @@ func (f *Function) CallExtern(fn *Function, parameters []*expression.Expression)
 	f.Number(asm.PUSH, 0)
 	f.Number(asm.PUSH, 0)
 	f.RegisterNumber(asm.SUB, x86.RSP, 32)
-	f.DLLCall(fmt.Sprintf("%s.%s", fn.Package, fn.Name))
+	f.DLLCall(fn.UniqueName)
 	f.RegisterRegister(asm.MOVE, x86.RSP, x86.RBP)
 	f.Register(asm.POP, x86.RBP)
 
diff --git a/src/data/Finalize.go b/src/data/Finalize.go
index b890ae0..aa0787a 100644
--- a/src/data/Finalize.go
+++ b/src/data/Finalize.go
@@ -9,19 +9,22 @@ import (
 // It will try to reuse existing data whenever possible.
 func (data Data) Finalize() ([]byte, map[string]int32) {
 	var (
-		final     []byte
 		keys      = make([]string, 0, len(data))
 		positions = make(map[string]int32, len(data))
+		capacity  = 0
 	)
 
-	for key := range data {
+	for key, value := range data {
 		keys = append(keys, key)
+		capacity += len(value)
 	}
 
 	sort.SliceStable(keys, func(i, j int) bool {
 		return len(data[keys[i]]) > len(data[keys[j]])
 	})
 
+	final := make([]byte, 0, capacity)
+
 	for _, key := range keys {
 		raw := data[key]
 		position := bytes.Index(final, raw)
diff --git a/src/data/bench_test.go b/src/data/bench_test.go
new file mode 100644
index 0000000..3c6987e
--- /dev/null
+++ b/src/data/bench_test.go
@@ -0,0 +1,21 @@
+package data_test
+
+import (
+	"testing"
+
+	"git.urbach.dev/cli/q/src/data"
+)
+
+func BenchmarkFinalize(b *testing.B) {
+	d := data.Data{}
+	d.Insert("1", []byte("Beautiful is better than ugly."))
+	d.Insert("2", []byte("Explicit is better than implicit."))
+	d.Insert("3", []byte("Simple is better than complex."))
+	d.Insert("4", []byte("Complex is better than complicated."))
+	d.Insert("5", []byte("Flat is better than nested."))
+	d.Insert("6", []byte("Sparse is better than dense."))
+
+	for b.Loop() {
+		d.Finalize()
+	}
+}
diff --git a/src/x86/Push.go b/src/x86/Push.go
index 9a2c233..0ef49e8 100644
--- a/src/x86/Push.go
+++ b/src/x86/Push.go
@@ -6,13 +6,9 @@ import (
 )
 
 // PushNumber pushes a number onto the stack.
-func PushNumber(code []byte, number int) []byte {
+func PushNumber(code []byte, number int32) []byte {
 	length := sizeof.Signed(number)
 
-	if length >= 8 {
-		panic("x86 does not support pushing 64-bit numbers")
-	}
-
 	if length >= 2 {
 		return append(
 			code,
diff --git a/src/x86/Push_test.go b/src/x86/Push_test.go
index 30f1a68..138478d 100644
--- a/src/x86/Push_test.go
+++ b/src/x86/Push_test.go
@@ -10,7 +10,7 @@ import (
 
 func TestPushNumber(t *testing.T) {
 	usagePatterns := []struct {
-		Number int
+		Number int32
 		Code   []byte
 	}{
 		{0, []byte{0x6A, 0x00}},