From c2e4114941581d2ba0ef7ee88976007caf837228 Mon Sep 17 00:00:00 2001
From: Jake Bailey <5341706+jakebailey@users.noreply.github.com>
Date: Mon, 22 Jun 2026 15:16:29 -0700
Subject: [PATCH] Default to GOGC=50

---
 cmd/tsgo/main.go      | 2 ++
 internal/core/core.go | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/cmd/tsgo/main.go b/cmd/tsgo/main.go
index 8d6816fa3d4..f264cc32a8f 100644
--- a/cmd/tsgo/main.go
+++ b/cmd/tsgo/main.go
@@ -16,6 +16,8 @@ func main() {
 
 func runMain() int {
 	core.ApplyDebugStackLimit()
+	core.ApplyDefaultGOGC()
+
 	args := os.Args[1:]
 	if len(args) > 0 {
 		switch args[0] {
diff --git a/internal/core/core.go b/internal/core/core.go
index 1ce98a8c744..22e4c62617a 100644
--- a/internal/core/core.go
+++ b/internal/core/core.go
@@ -33,6 +33,14 @@ func ApplyDebugStackLimit() {
 	rtdebug.SetMaxStack(n)
 }
 
+func ApplyDefaultGOGC() {
+	v := os.Getenv("GOGC") //nolint:forbidigo
+	if v != "" {
+		return
+	}
+	rtdebug.SetGCPercent(50)
+}
+
 func Filter[T any](slice []T, f func(T) bool) []T {
 	for i, value := range slice {
 		if !f(value) {