diff --git a/app/game/[id]/game-page-client.tsx b/app/game/[id]/game-page-client.tsx
index 1f08d4d..ef2dd1c 100644
--- a/app/game/[id]/game-page-client.tsx
+++ b/app/game/[id]/game-page-client.tsx
@@ -33,6 +33,8 @@ import { UpscalerBarChart } from "@/components/charts/UpscalerBarChart"
 import { FpsBoxplot } from "@/components/charts/FpsBoxplot"
 import { FpsRangeChart } from "@/components/charts/FpsRangeChart"
 import { DeviceDonut } from "@/components/charts/DeviceDonut"
+import { PerformanceTierChart } from "@/components/charts/PerformanceTierChart"
+import { StabilityScatterChart } from "@/components/charts/StabilityScatterChart"
 
 // Comments
 import { CommentSection } from "@/components/comments/comment-section"
@@ -149,6 +151,20 @@ interface StatsResponse {
         hardwareName: string
         count: number
     }>
+    performanceTiers: Array<{
+        hardwareSlug: string
+        unplayable: number
+        playable: number
+        smooth: number
+        excellent: number
+    }>
+    stabilityScatter: Array<{
+        id: string
+        hardwareSlug: string
+        fpsAvg: number
+        fpsOnePercentLow: number
+        stabilityRatio: number
+    }>
     filterOptions: {
         protonVersions: string[]
         osVersions: string[]
@@ -352,6 +368,8 @@ export function GamePageClient({
             upscalerStats: filterUpscaler(stats.upscalerStats),
             fpsRange: filterByDevice(stats.fpsRange),
             deviceBreakdown: filterByDevice(stats.deviceBreakdown),
+            performanceTiers: filterByDevice(stats.performanceTiers),
+            stabilityScatter: filterByDevice(stats.stabilityScatter),
         }
     }, [stats, selectedDevices, filters])
 
@@ -1030,6 +1048,31 @@ export function GamePageClient({
                         </div>
                     )}
 
+                    {/* Row 4 — Performance Tiers + Stability Scatter */}
+                    {filteredStats && (
+                        <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
+                            {filteredStats.performanceTiers.length > 0 && (
+                                <div className="rounded-xl border border-border bg-text/3 p-4">
+                                    <h3 className="text-sm font-medium text-text/80 mb-2">
+                                        Performance Tiers
+                                    </h3>
+                                    <PerformanceTierChart data={filteredStats.performanceTiers} />
+                                </div>
+                            )}
+                            {filteredStats.stabilityScatter.length > 0 && (
+                                <div className="rounded-xl border border-border bg-text/3 p-4">
+                                    <h3 className="text-sm font-medium text-text/80 mb-2">
+                                        Avg FPS vs 1% Low (Stability)
+                                    </h3>
+                                    <StabilityScatterChart
+                                        data={filteredStats.stabilityScatter}
+                                        deviceNames={Object.fromEntries(filteredStats.deviceBreakdown.map((d) => [d.hardwareSlug, d.hardwareName]))}
+                                    />
+                                </div>
+                            )}
+                        </div>
+                    )}
+
                 </div>
             </motion.div>
 
diff --git a/components/charts/PerformanceTierChart.tsx b/components/charts/PerformanceTierChart.tsx
new file mode 100644
index 0000000..91600d6
--- /dev/null
+++ b/components/charts/PerformanceTierChart.tsx
@@ -0,0 +1,72 @@
+"use client"
+
+import { EChartWrapper } from "./EChartWrapper"
+
+interface TierData {
+  hardwareSlug: string
+  hardwareName?: string
+  unplayable: number
+  playable: number
+  smooth: number
+  excellent: number
+}
+
+export function PerformanceTierChart({ data }: { data: TierData[] }) {
+  if (!data || data.length === 0) {
+    return <div className="flex items-center justify-center h-48 text-sm text-text/40">No tier data</div>
+  }
+
+  const labels = data.map((d) => d.hardwareName || d.hardwareSlug)
+
+  const option = {
+    tooltip: {
+      trigger: "axis" as const,
+      axisPointer: { type: "shadow" as const },
+    },
+    legend: {
+      data: ["<30 fps", "30-59", "60-119", "≥120"],
+      textStyle: { color: "#999" },
+      top: 0,
+    },
+    grid: { left: 100, right: 20, top: 40, bottom: 30 },
+    xAxis: { type: "value" as const, splitLine: { lineStyle: { color: "#333" } } },
+    yAxis: {
+      type: "category" as const,
+      data: labels,
+      axisLine: { lineStyle: { color: "#555" } },
+      axisLabel: { color: "#999" },
+    },
+    series: [
+      {
+        name: "<30 fps",
+        type: "bar" as const,
+        stack: "total",
+        data: data.map((d) => d.unplayable),
+        itemStyle: { color: "#ef4444" },
+      },
+      {
+        name: "30-59",
+        type: "bar" as const,
+        stack: "total",
+        data: data.map((d) => d.playable),
+        itemStyle: { color: "#eab308" },
+      },
+      {
+        name: "60-119",
+        type: "bar" as const,
+        stack: "total",
+        data: data.map((d) => d.smooth),
+        itemStyle: { color: "#22c55e" },
+      },
+      {
+        name: "≥120",
+        type: "bar" as const,
+        stack: "total",
+        data: data.map((d) => d.excellent),
+        itemStyle: { color: "#3b82f6" },
+      },
+    ],
+  }
+
+  return <EChartWrapper option={option} height={250} />
+}
diff --git a/components/charts/StabilityScatterChart.tsx b/components/charts/StabilityScatterChart.tsx
new file mode 100644
index 0000000..6cbed23
--- /dev/null
+++ b/components/charts/StabilityScatterChart.tsx
@@ -0,0 +1,80 @@
+"use client"
+
+import { EChartWrapper } from "./EChartWrapper"
+
+interface ScatterPoint {
+  id: string
+  hardwareSlug: string
+  fpsAvg: number
+  fpsOnePercentLow: number
+  stabilityRatio: number
+}
+
+export function StabilityScatterChart({ data, deviceNames }: { data: ScatterPoint[]; deviceNames?: Record<string, string> }) {
+  if (!data || data.length === 0) {
+    return <div className="flex items-center justify-center h-48 text-sm text-text/40">No stability data yet</div>
+  }
+
+  // Group by device
+  const deviceGroups = new Map<string, ScatterPoint[]>()
+  for (const point of data) {
+    const existing = deviceGroups.get(point.hardwareSlug) || []
+    existing.push(point)
+    deviceGroups.set(point.hardwareSlug, existing)
+  }
+
+  const colors = ["#3b82f6", "#22c55e", "#f59e0b", "#ef4444", "#8b5cf6"]
+  const series = Array.from(deviceGroups.entries()).map(([slug, points], idx) => ({
+    name: deviceNames?.[slug] || slug,
+    type: "scatter" as const,
+    data: points.map((p) => [p.fpsAvg, p.fpsOnePercentLow]),
+    itemStyle: { color: colors[idx % colors.length] },
+    symbolSize: 8,
+  }))
+
+  // Perfect stability line (y = x)
+  const maxFps = Math.max(...data.map((d) => d.fpsAvg))
+  const perfectLine = {
+    name: "Perfect Stability",
+    type: "line" as const,
+    data: [
+      [0, 0],
+      [maxFps, maxFps],
+    ],
+    lineStyle: { color: "#555", type: "dashed" as const },
+    symbol: "none",
+    silent: true,
+  }
+
+  const option = {
+    tooltip: {
+      trigger: "item" as const,
+      formatter: (params: any) => {
+        if (params.seriesName === "Perfect Stability") return ""
+        return `${params.seriesName}<br/>Avg: ${params.value[0]} fps<br/>1% Low: ${params.value[1]} fps`
+      },
+    },
+    legend: {
+      textStyle: { color: "#999" },
+      top: 0,
+    },
+    grid: { left: 60, right: 20, top: 40, bottom: 40 },
+    xAxis: {
+      type: "value" as const,
+      name: "Avg FPS",
+      nameTextStyle: { color: "#999" },
+      splitLine: { lineStyle: { color: "#333" } },
+      axisLabel: { color: "#999" },
+    },
+    yAxis: {
+      type: "value" as const,
+      name: "1% Low FPS",
+      nameTextStyle: { color: "#999" },
+      splitLine: { lineStyle: { color: "#333" } },
+      axisLabel: { color: "#999" },
+    },
+    series: [...series, perfectLine],
+  }
+
+  return <EChartWrapper option={option} height={300} />
+}
diff --git a/lib/api/game-stats.ts b/lib/api/game-stats.ts
index 3c6a0c6..8531530 100644
--- a/lib/api/game-stats.ts
+++ b/lib/api/game-stats.ts
@@ -252,7 +252,34 @@ export const gameStatsRoutes = new Elysia({ prefix: "/games" }).get(
       }),
     )
 
-    // ── 9. Filter options ────────────────────────────────────────
+    // ── 9. Performance tier breakdown per device ────────────────
+    const tierMap = new Map<string, { unplayable: number; playable: number; smooth: number; excellent: number }>()
+    for (const e of entries) {
+      const existing = tierMap.get(e.hardwareSlug) || { unplayable: 0, playable: 0, smooth: 0, excellent: 0 }
+      if (e.fpsAvg < 30) existing.unplayable++
+      else if (e.fpsAvg < 60) existing.playable++
+      else if (e.fpsAvg < 120) existing.smooth++
+      else existing.excellent++
+      tierMap.set(e.hardwareSlug, existing)
+    }
+
+    const performanceTiers = Array.from(tierMap.entries()).map(([slug, tiers]) => ({
+      hardwareSlug: slug,
+      ...tiers,
+    }))
+
+    // ── 10. Stability scatter data ──────────────────────────────
+    const stabilityScatter = entries
+      .filter((e) => e.fpsOnePercentLow != null)
+      .map((e) => ({
+        id: e.id,
+        hardwareSlug: e.hardwareSlug,
+        fpsAvg: e.fpsAvg ?? 0,
+        fpsOnePercentLow: e.fpsOnePercentLow!,
+        stabilityRatio: e.fpsAvg > 0 ? Math.min(1, e.fpsOnePercentLow! / e.fpsAvg) : 0,
+      }))
+
+    // ── 11. Filter options ────────────────────────────────────────
     const protonVersions = [
       ...new Set(entries.map((e) => e.protonVersion).filter(Boolean)),
     ] as string[]
@@ -277,6 +304,8 @@ export const gameStatsRoutes = new Elysia({ prefix: "/games" }).get(
       upscalerStats,
       fpsRange,
       deviceBreakdown,
+      performanceTiers,
+      stabilityScatter,
       filterOptions: { protonVersions, osVersions },
     }
   },