From 5c1fd5888e3d4a8a96b702077c91a238a8ea97db Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Sat, 17 Jan 2026 18:50:44 +0000
Subject: [PATCH] Optimize drw_map performance by replacing XSync with XFlush

Replaced the blocking `XSync` call with `XFlush` in `drw_map`. This
eliminates unnecessary round-trips to the X server during drawing
operations, significantly reducing latency and improving responsiveness
for frequent UI updates (like status bar refreshes and window redrawing).

`XFlush` is sufficient here as it pushes the `XCopyArea` request to the
server without waiting for a reply, which is safe since we do not need
immediate feedback from the server for this operation.
---
 drw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drw.c b/drw.c
index 7e99a386..85f47e3d 100644
--- a/drw.c
+++ b/drw.c
@@ -494,7 +494,8 @@ void drw_map(Drw *drw, Window win, int x, int y, unsigned int w,
     }
 
     XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
-    XSync(drw->dpy, False);
+    /* XFlush is sufficient here and faster than XSync (no round-trip) */
+    XFlush(drw->dpy);
 }
 
 unsigned int drw_fontset_getwidth(Drw *drw, const char *text) {