diff --git a/src/Config.zig b/src/Config.zig
index fdef5a40c..bb618717e 100644
--- a/src/Config.zig
+++ b/src/Config.zig
@@ -98,6 +98,7 @@ const CommonOptions = .{
     .{ .name = "cookie_jar", .type = ?[]const u8 },
     .{ .name = "storage_engine", .type = ?Storage.EngineType },
     .{ .name = "storage_sqlite_path", .type = ?[:0]const u8 },
+    .{ .name = "disable_subframes", .type = bool },
 };
 
 fn dumpValidator(_: Allocator, args: *std.process.ArgIterator) !?DumpFormat {
@@ -239,6 +240,13 @@ pub fn obeyRobots(self: *const Config) bool {
     };
 }
 
+pub fn disableSubframes(self: *const Config) bool {
+    return switch (self.mode) {
+        inline .serve, .fetch, .mcp => |opts| opts.disable_subframes,
+        else => unreachable,
+    };
+}
+
 pub fn httpProxy(self: *const Config) ?[:0]const u8 {
     return switch (self.mode) {
         inline .serve, .fetch, .mcp => |opts| opts.http_proxy,
@@ -526,6 +534,17 @@ pub fn printUsageAndExit(self: *const Config, success: bool) void {
         \\                we make requests towards.
         \\                Defaults to false.
         \\
+        \\--disable-subframes
+        \\                Skip loading <iframe> elements. The HTML parser registers them
+        \\                in the DOM but no child frame, document fetch, or
+        \\                Page.frameAttached / Runtime.executionContextCreated events are
+        \\                produced. Useful for pages that load many analytics / pixel
+        \\                iframes where each subframe navigation invalidates driver-side
+        \\                executionContextIds (lightpanda-io/browser#2400). On the CDP
+        \\                serve path, drivers can also toggle this per-session via the
+        \\                LP.configureLoading method.
+        \\                Defaults to false.
+        \\
         \\--block-private-networks
         \\                Blocks HTTP requests to private/internal IP addresses
         \\                after DNS resolution. Useful for sandboxing, multi-tenant
diff --git a/src/browser/Frame.zig b/src/browser/Frame.zig
index 0f6529e34..544bbf172 100644
--- a/src/browser/Frame.zig
+++ b/src/browser/Frame.zig
@@ -1303,6 +1303,11 @@ pub fn iframeAddedCallback(self: *Frame, iframe: *IFrame) !void {
     if (iframe._executed) {
         return;
     }
+    if (!self._session.subframe_loading_enabled) {
+        // configured not to load frames
+        iframe._executed = true;
+        return;
+    }
 
     var src = iframe.asElement().getAttributeSafe(comptime .wrap("src")) orelse "";
     if (src.len == 0) {
diff --git a/src/browser/Session.zig b/src/browser/Session.zig
index eab13c61a..0f83b95df 100644
--- a/src/browser/Session.zig
+++ b/src/browser/Session.zig
@@ -78,6 +78,9 @@ _pending: ?*Page = null,
 frame_id_gen: u32 = 0,
 loader_id_gen: u32 = 0,
 
+// configuration (or CDP command) to disable iframe loading
+subframe_loading_enabled: bool = true,
+
 pub fn init(self: *Session, browser: *Browser, notification: *Notification) !void {
     const allocator = browser.app.allocator;
     const arena_pool = browser.arena_pool;
@@ -96,6 +99,8 @@ pub fn init(self: *Session, browser: *Browser, notification: *Notification) !voi
         .notification = notification,
         .fc_identity_pool = .init(allocator),
         .cookie_jar = storage.Cookie.Jar.init(allocator),
+        // CLI default; LP.configureLoading can flip this per-session.
+        .subframe_loading_enabled = !browser.app.config.disableSubframes(),
     };
 }
 
diff --git a/src/cdp/domains/lp.zig b/src/cdp/domains/lp.zig
index 2b042c991..471c984c7 100644
--- a/src/cdp/domains/lp.zig
+++ b/src/cdp/domains/lp.zig
@@ -42,6 +42,7 @@ pub fn processMessage(cmd: *CDP.Command) !void {
         scrollNode,
         waitForSelector,
         handleJavaScriptDialog,
+        configureLoading,
     }, cmd.input.action) orelse return error.UnknownMethod;
 
     switch (action) {
@@ -56,9 +57,20 @@ pub fn processMessage(cmd: *CDP.Command) !void {
         .scrollNode => return scrollNode(cmd),
         .waitForSelector => return waitForSelector(cmd),
         .handleJavaScriptDialog => return handleJavaScriptDialog(cmd),
+        .configureLoading => return configureLoading(cmd),
     }
 }
 
+fn configureLoading(cmd: *CDP.Command) !void {
+    const params = (try cmd.params(struct {
+        subFrame: bool = true,
+    })) orelse return error.InvalidParams;
+
+    const bc = cmd.browser_context orelse return error.NoBrowserContext;
+    bc.session.subframe_loading_enabled = params.subFrame;
+    return cmd.sendResult(null, .{});
+}
+
 fn getSemanticTree(cmd: anytype) !void {
     const Params = struct {
         format: ?enum { text } = null,