diff --git a/examples/calculator/src/index.tsx b/examples/calculator/src/index.tsx
index 852911990..a2ed8284b 100644
--- a/examples/calculator/src/index.tsx
+++ b/examples/calculator/src/index.tsx
@@ -403,7 +403,7 @@ class CalculatorApp extends Widget {
     }
 
     private evaluate() {
-        if (this.expression.trim() === "") return;
+        if (this.expression.trim().length === 0) return;
         const oldExpr = this.expression;
         this.result = safeEval(this.expression);
         if (this.result !== null && !this.result.startsWith("Error")) {
diff --git a/examples/widget-gallery/src/index.ts b/examples/widget-gallery/src/index.ts
index 57b141244..ec688a7fc 100644
--- a/examples/widget-gallery/src/index.ts
+++ b/examples/widget-gallery/src/index.ts
@@ -129,7 +129,7 @@ class WidgetGalleryApp extends Widget {
         }
 
         // Tab switching: 1-6
-        const num = parseInt(event.key);
+        const num = parseInt(event.key, 10);
         if (num >= 1 && num <= 6) {
             this._switchTab(num - 1);
             return true;
diff --git a/packages/dev-server/src/devtools.ts b/packages/dev-server/src/devtools.ts
index 17222d074..8ba43a836 100644
--- a/packages/dev-server/src/devtools.ts
+++ b/packages/dev-server/src/devtools.ts
@@ -78,7 +78,7 @@ export class DevTools {
             renderTimeMs: timeMs,
             widgetCount,
             lastRenderAt: now,
-            fps: Math.round(fps * 10) / 10,
+            fps: Math.round(fps * 10 + Number.EPSILON) / 10,
             memoryMB: Math.round((process.memoryUsage?.().heapUsed ?? 0) / 1024 / 1024 * 10) / 10,
         };
     }