From 47ea8de2777051bce249f666b10580f168d8d72a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Donny/=EA=B0=95=EB=8F=99=EC=9C=A4?= <kdy1997.dev@gmail.com>
Date: Mon, 20 Jan 2025 01:37:55 +0900
Subject: [PATCH] perf(es/minifier): Adjust threshold for parallel char
 frequency calculation (#9901)

---
 .changeset/warm-tigers-approve.md           |  6 ++++++
 crates/swc_ecma_minifier/src/util/base54.rs | 14 +++++++-------
 2 files changed, 13 insertions(+), 7 deletions(-)
 create mode 100644 .changeset/warm-tigers-approve.md

diff --git a/.changeset/warm-tigers-approve.md b/.changeset/warm-tigers-approve.md
new file mode 100644
index 000000000000..1a9545ca6d45
--- /dev/null
+++ b/.changeset/warm-tigers-approve.md
@@ -0,0 +1,6 @@
+---
+swc_core: patch
+swc_ecma_minifier: patch
+---
+
+perf(es/minifier): Adjust threshold for parallel char frequency calculation
diff --git a/crates/swc_ecma_minifier/src/util/base54.rs b/crates/swc_ecma_minifier/src/util/base54.rs
index 5e469b2a3d36..56f2eeec4a16 100644
--- a/crates/swc_ecma_minifier/src/util/base54.rs
+++ b/crates/swc_ecma_minifier/src/util/base54.rs
@@ -327,19 +327,19 @@ impl Visit for CharFreqAnalyzer<'_> {
     visit_obj_and_computed!();
 
     fn visit_class_members(&mut self, members: &[ClassMember]) {
-        self.maybe_par(cpu_count(), members, |v, member| {
+        self.maybe_par(cpu_count() * 8, members, |v, member| {
             member.visit_with(v);
         });
     }
 
     fn visit_expr_or_spreads(&mut self, n: &[ExprOrSpread]) {
-        self.maybe_par(cpu_count(), n, |v, n| {
+        self.maybe_par(cpu_count() * 8, n, |v, n| {
             n.visit_with(v);
         });
     }
 
     fn visit_exprs(&mut self, exprs: &[Box<Expr>]) {
-        self.maybe_par(cpu_count(), exprs, |v, expr| {
+        self.maybe_par(cpu_count() * 8, exprs, |v, expr| {
             expr.visit_with(v);
         });
     }
@@ -361,13 +361,13 @@ impl Visit for CharFreqAnalyzer<'_> {
     fn visit_module_export_name(&mut self, _: &ModuleExportName) {}
 
     fn visit_module_items(&mut self, items: &[ModuleItem]) {
-        self.maybe_par(cpu_count(), items, |v, item| {
+        self.maybe_par(cpu_count() * 8, items, |v, item| {
             item.visit_with(v);
         });
     }
 
     fn visit_opt_vec_expr_or_spreads(&mut self, n: &[Option<ExprOrSpread>]) {
-        self.maybe_par(cpu_count(), n, |v, n| {
+        self.maybe_par(cpu_count() * 8, n, |v, n| {
             n.visit_with(v);
         });
     }
@@ -383,13 +383,13 @@ impl Visit for CharFreqAnalyzer<'_> {
     }
 
     fn visit_prop_or_spreads(&mut self, n: &[PropOrSpread]) {
-        self.maybe_par(cpu_count(), n, |v, n| {
+        self.maybe_par(cpu_count() * 8, n, |v, n| {
             n.visit_with(v);
         });
     }
 
     fn visit_stmts(&mut self, stmts: &[Stmt]) {
-        self.maybe_par(cpu_count(), stmts, |v, stmt| {
+        self.maybe_par(cpu_count() * 8, stmts, |v, stmt| {
             stmt.visit_with(v);
         });
     }