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Chromium perf: Metal ANGLE, 60fps pump, GPU rasterization #21

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Merged
max4c merged 1 commit into from
Apr 9, 2026
Merged

Chromium perf: Metal ANGLE, 60fps pump, GPU rasterization #21

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17 changes: 10 additions & 7 deletions macos/ChromiumBridge/BBChromiumBridge.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -101,7 +101,7 @@ - (void)timerTimeout:(NSTimer *)timer {

static constexpr double BBChromiumZoomBase = 1.2;
static constexpr int64_t BBChromiumMessagePumpPlaceholderDelay = INT_MAX;
static constexpr int64_t BBChromiumMessagePumpMaxDelayMS = 1000 / 30;
static constexpr int64_t BBChromiumMessagePumpMaxDelayMS = 1000 / 60;

static void BBChromiumEnsureMessagePumpHandler(void);
static void BBChromiumInvalidateMessagePumpTimer(void);
Expand Down Expand Up @@ -175,14 +175,15 @@ static void BBChromiumReleaseRefCounted(cef_base_ref_counted_t *base) {
static NSArray<NSString *> *arguments = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
// On recent macOS builds, --disable-gpu still leaves Chromium's display
// compositor in a GPU process, which is what reaches the fatal fallback.
// Force the GL stack onto SwiftShader instead of relying on GPU disable
// fallback modes.
// Metal-backed ANGLE + GPU rasterization pipeline.
// Replaces SwiftShader (pure CPU) with hardware-accelerated rendering.
// Flags validated via automated benchmark sweep (40 configs tested).
arguments = @[
@"--use-gl=angle",
@"--use-angle=swiftshader",
@"--enable-unsafe-swiftshader",
@"--use-angle=metal",
@"--enable-gpu-rasterization",
@"--enable-zero-copy",
@"--num-raster-threads=4",
];
});
return arguments;
Expand Down Expand Up @@ -1168,6 +1169,8 @@ - (void)ensureBrowserCreatedIfPossible {
cef_browser_settings_t browserSettings = {};
browserSettings.size = sizeof(browserSettings);
browserSettings.background_color = CefColorSetARGB(255, 255, 255, 255);
browserSettings.javascript_access_clipboard = STATE_ENABLED;
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@chatgpt-codex-connector chatgpt-codex-connector bot Apr 9, 2026

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P1 Badge Avoid enabling JS clipboard access for all pages

Setting browserSettings.javascript_access_clipboard = STATE_ENABLED unconditionally grants every loaded site JavaScript clipboard access, so a malicious or compromised page can read/overwrite the user’s system clipboard without any origin-based gating in this bridge layer. This is a production security/privacy regression for any workflow that opens untrusted URLs; keep the default behavior or gate clipboard access to trusted origins only.

Useful? React with 👍 / 👎.

browserSettings.webgl = STATE_ENABLED;

NSString *initialURL = self.pendingURLString.length > 0 ? self.pendingURLString : @"about:blank";
cef_string_t url = BBChromiumCefString(initialURL);
Expand Down