From 32bbc93eea5022fbde428b55ae0c73e8edcb7202 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Mon, 6 Jul 2026 22:40:20 +0300
Subject: [PATCH] Open read-only files as r+b on web builds (apparently
 read-only files have perf issues)

---
 libs/io/source/file_stream.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libs/io/source/file_stream.cpp b/libs/io/source/file_stream.cpp
index 5e0a5b7e..01796abf 100644
--- a/libs/io/source/file_stream.cpp
+++ b/libs/io/source/file_stream.cpp
@@ -41,7 +41,11 @@ namespace psemek::io
 #else
 		char const * fopen_read_mode()
 		{
+#ifdef __EMSCRIPTEN__
+			return "r+b";
+#else
 			return "rb";
+#endif
 		}
 
 		char const * fopen_write_mode(unsigned flags)