diff --git a/src/app/api/submit/route.ts b/src/app/api/submit/route.ts
index 710c6d6..cf862d5 100644
--- a/src/app/api/submit/route.ts
+++ b/src/app/api/submit/route.ts
@@ -220,7 +220,8 @@ export async function POST(request: NextRequest) {
 		// Download the image of the Mii (3DS)
 		if (platform === "THREE_DS") {
 			const studioUrl = conversion?.mii.studioUrl({ width: 512 });
-			const studioResponse = await fetch(studioUrl!);
+			if (!studioUrl || new URL(studioUrl).hostname !== "studio.mii.nintendo.com") throw new Error("Invalid studio URL");
+			const studioResponse = await fetch(studioUrl);
 
 			if (!studioResponse.ok) {
 				throw new Error(`Failed to fetch Mii image ${studioResponse.status}`);
diff --git a/src/app/mii/[id]/image/route.ts b/src/app/mii/[id]/image/route.ts
index ced1e92..da9a272 100644
--- a/src/app/mii/[id]/image/route.ts
+++ b/src/app/mii/[id]/image/route.ts
@@ -20,7 +20,7 @@ const searchParamsSchema = z.object({
 
 export async function GET(request: NextRequest, { params }: { params: Promise<{ id: string }> }) {
 	const rateLimit = new RateLimit(request, 200, "/mii/image");
-	const check = await rateLimit.handle();
+	const check = await rateLimit.handleByIp();
 	if (check) return check;
 
 	const { id: slugId } = await params;
@@ -107,9 +107,12 @@ export async function GET(request: NextRequest, { params }: { params: Promise<{
 		});
 	}
 
+	// mii, features are purged on edit; qr-code is immutable. imageN isn't purged, so keep its TTL short.
+	const isStableType = imageType === "mii" || imageType === "qr-code" || imageType === "features";
+
 	return rateLimit.sendResponse(buffer, 200, {
 		"Content-Type": "image/png",
 		"X-Robots-Tag": "noindex, noimageindex, nofollow",
-		"Cache-Control": "public, max-age=60, stale-while-revalidate=30",
+		"Cache-Control": isStableType ? "public, max-age=3600, stale-while-revalidate=86400" : "public, max-age=60, stale-while-revalidate=30",
 	});
 }
diff --git a/src/app/mii/[id]/page.tsx b/src/app/mii/[id]/page.tsx
index 17863ac..ec31c1e 100644
--- a/src/app/mii/[id]/page.tsx
+++ b/src/app/mii/[id]/page.tsx
@@ -1,3 +1,4 @@
+import { cache } from "react";
 import { Metadata } from "next";
 import Image from "next/image";
 import Link from "next/link";
@@ -5,7 +6,6 @@ import { redirect } from "next/navigation";
 
 import { Icon } from "@iconify/react";
 
-import { auth } from "@/lib/auth";
 import { prisma } from "@/lib/prisma";
 import { MiiPlatform } from "@prisma/client";
 
@@ -25,24 +25,21 @@ interface Props {
 	params: Promise<{ id: string }>;
 }
 
+export const revalidate = 300;
+
+const getMii = cache(async (id: number) =>
+	prisma.mii.findUnique({
+		where: { id },
+		include: {
+			user: { select: { name: true } },
+			_count: { select: { likedBy: true } },
+		},
+	}),
+);
+
 export async function generateMetadata({ params }: Props): Promise<Metadata> {
 	const { id } = await params;
-
-	const mii = await prisma.mii.findUnique({
-		where: {
-			id: Number(id),
-		},
-		include: {
-			user: {
-				select: {
-					name: true,
-				},
-			},
-			_count: {
-				select: { likedBy: true }, // Get total like count
-			},
-		},
-	});
+	const mii = await getMii(Number(id));
 
 	// Bots get redirected anyways
 	if (!mii) return {};
@@ -90,31 +87,7 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
 
 export default async function MiiPage({ params }: Props) {
 	const { id } = await params;
-	const session = await auth();
-
-	const mii = await prisma.mii.findUnique({
-		where: {
-			id: Number(id),
-		},
-		include: {
-			user: {
-				select: {
-					name: true,
-				},
-			},
-			likedBy: session?.user
-				? {
-						where: {
-							userId: Number(session.user.id),
-						},
-						select: { userId: true },
-					}
-				: false,
-			_count: {
-				select: { likedBy: true }, // Get total like count
-			},
-		},
-	});
+	const mii = await getMii(Number(id));
 
 	if (!mii) redirect("/404");
 
@@ -333,7 +306,7 @@ export default async function MiiPage({ params }: Props) {
 								{/* Submission name */}
 								<h1 className="text-4xl font-extrabold wrap-break-word whitespace-break-spaces text-amber-700 flex-1 min-w-0">{mii.name}</h1>
 								{/* Like button */}
-								<LikeButton likes={mii._count.likedBy ?? 0} miiId={mii.id} isLiked={(mii.likedBy ?? []).length > 0} big />
+								<LikeButton likes={mii._count.likedBy ?? 0} miiId={mii.id} isLiked={false} big />
 							</div>
 							{/* Tags */}
 							<div id="tags" className="flex flex-wrap gap-1 mt-1 *:px-2 *:py-1 *:bg-orange-300 *:rounded-full *:text-xs">
diff --git a/src/lib/auth.ts b/src/lib/auth.ts
index b965236..f090e8a 100644
--- a/src/lib/auth.ts
+++ b/src/lib/auth.ts
@@ -13,10 +13,11 @@ export const { handlers, signIn, signOut, auth } = NextAuth({
 		signIn: "/login",
 	},
 	callbacks: {
-		async signIn({ user }) {
+		async signIn({ user, account, profile }) {
 			const blacklist = process.env.BLACKLISTED_EMAILS ? process.env.BLACKLISTED_EMAILS.split(",").map((item) => item.trim().toLowerCase()) : [];
 			const email = user?.email?.toLowerCase();
 			if (!email) return false;
+			if (account?.provider === "google" && (profile as { email_verified?: boolean })?.email_verified === false) return false;
 			if (blacklist?.some((blocked) => email.endsWith(blocked))) return false;
 			return true;
 		},
diff --git a/src/lib/rate-limit.ts b/src/lib/rate-limit.ts
index b8a53c4..b24d3b0 100644
--- a/src/lib/rate-limit.ts
+++ b/src/lib/rate-limit.ts
@@ -107,4 +107,13 @@ export class RateLimit {
 		if (!this.data.success) return this.sendResponse({ error: "Rate limit exceeded. Please try again later." }, 429);
 		return;
 	}
+
+	// IP-only variant — skips the session lookup for anonymous read paths like images
+	async handleByIp(): Promise<NextResponse<object | unknown> | undefined> {
+		const ip = this.request.headers.get("CF-Connecting-IP") || this.request.headers.get("X-Forwarded-For")?.split(",")[0] || "anonymous";
+		this.data = await this.check(ip);
+
+		if (!this.data.success) return this.sendResponse({ error: "Rate limit exceeded. Please try again later." }, 429);
+		return;
+	}
 }