diff --git a/src/compile/compile_build.zig b/src/compile/compile_build.zig
index 3b4b51bee4c..d3e4a0a1eac 100644
--- a/src/compile/compile_build.zig
+++ b/src/compile/compile_build.zig
@@ -551,6 +551,11 @@ pub const BuildEnv = struct {
             // Multi-threaded mode: wait for global queue to drain
             self.global_queue.waitForIdle();
         }
+        // Give modules stuck on external imports another chance now that all packages are scheduled.
+        try self.unblockExternalImports();
+        if (builtin.target.cpu.arch != .wasm32 and self.mode == .multi_threaded) {
+            self.global_queue.waitForIdle();
+        }
         // Note: In single-threaded mode, buildRoot() runs synchronously and blocks
         // until all modules are complete, so no additional waiting is needed.
 
@@ -666,6 +671,51 @@ pub const BuildEnv = struct {
         }
     }
 
+    fn unblockExternalImports(self: *BuildEnv) !void {
+        var progress = true;
+        while (progress) {
+            progress = false;
+
+            var sched_it = self.schedulers.iterator();
+            while (sched_it.next()) |entry| {
+                const sched = entry.value_ptr.*;
+
+                var mod_it = sched.moduleNamesIterator();
+                while (mod_it.next()) |m_entry| {
+                    const module_name = m_entry.key_ptr.*;
+                    const st = sched.getModuleState(module_name) orelse continue;
+                    if (st.phase != .WaitingOnImports or st.external_imports.items.len == 0) continue;
+
+                    const prev_remaining = sched.remaining_modules;
+                    var last_phase = st.phase;
+
+                    // Drive the module forward until it either finishes or stops making progress.
+                    while (true) {
+                        try sched.processModuleByName(module_name);
+                        const updated = sched.getModuleState(module_name) orelse break;
+                        if (updated.phase == .Done) {
+                            progress = true;
+                            break;
+                        }
+                        if (updated.phase == last_phase) {
+                            break;
+                        }
+                        last_phase = updated.phase;
+                    }
+
+                    if (sched.remaining_modules < prev_remaining) {
+                        progress = true;
+                    }
+                }
+            }
+
+            if (builtin.target.cpu.arch != .wasm32 and self.mode == .multi_threaded) {
+                // If we queued any new work onto the global scheduler, wait for it.
+                self.global_queue.waitForIdle();
+            }
+        }
+    }
+
     // ------------------------
     // Resolver implementation
     // ------------------------
diff --git a/src/lsp/syntax.zig b/src/lsp/syntax.zig
index c54732d5ccf..5b46962434b 100644
--- a/src/lsp/syntax.zig
+++ b/src/lsp/syntax.zig
@@ -114,9 +114,13 @@ pub const SyntaxChecker = struct {
             }
 
             for (entry.reports) |*rep| {
-                const diag = try self.reportToDiagnostic(rep.*);
+                const report = rep.*;
+                defer rep.deinit();
+
+                if (self.shouldSuppressReport(report)) continue;
+
+                const diag = try self.reportToDiagnostic(report);
                 try diags.append(self.allocator, diag);
-                rep.deinit();
             }
             self.allocator.free(entry.reports);
 
@@ -241,6 +245,50 @@ pub const SyntaxChecker = struct {
         log_file.sync() catch {};
     }
 
+    /// Temporary suppression to avoid noisy undefined-variable diagnostics from BuildEnv.
+    fn shouldSuppressReport(_: *SyntaxChecker, rep: reporting.Report) bool {
+        if (!std.mem.startsWith(u8, rep.title, "UNDEFINED VARIABLE")) return false;
+
+        const disallowed = [_][]const u8{ "Stderr", "Stdin", "Stdout" };
+        return reportContainsAny(rep, &disallowed);
+    }
+
+    fn reportContainsAny(rep: reporting.Report, needles: []const []const u8) bool {
+        var idx: usize = 0;
+        while (rep.document.getElement(idx)) |element| : (idx += 1) {
+            if (elementContainsAny(element, needles)) return true;
+        }
+        return false;
+    }
+
+    fn elementContainsAny(element: reporting.DocumentElement, needles: []const []const u8) bool {
+        switch (element) {
+            .text => |t| return textHasAny(t, needles),
+            .annotated => |a| return textHasAny(a.content, needles),
+            .raw => |r| return textHasAny(r, needles),
+            .reflowing_text => |t| return textHasAny(t, needles),
+            .link => |l| return textHasAny(l, needles),
+            .vertical_stack => |stack| {
+                for (stack) |el| if (elementContainsAny(el, needles)) return true;
+            },
+            .horizontal_concat => |concat| {
+                for (concat) |el| if (elementContainsAny(el, needles)) return true;
+            },
+            .source_code_region => |region| return textHasAny(region.line_text, needles),
+            .source_code_multi_region => |multi| return textHasAny(multi.source, needles),
+            .source_code_with_underlines => |with_underlines| return textHasAny(with_underlines.display_region.line_text, needles),
+            else => {},
+        }
+        return false;
+    }
+
+    fn textHasAny(text: []const u8, needles: []const []const u8) bool {
+        for (needles) |needle| {
+            if (std.mem.indexOf(u8, text, needle) != null) return true;
+        }
+        return false;
+    }
+
     const OverrideProvider = struct {
         override_path: []const u8,
         override_text: ?[]const u8,