Migrate React components to Solid.js and optimize build

BUILD_OPTIMIZATION_REPORT.md

@@ -0,0 +1,117 @@
+# Build Optimization Report
+
+## Summary
+
+Reduced Astro build time by **~46%** (34s → 18.3s locally, projected ~25s on Vercel, down from ~50s).
+
+Five optimizations applied:
+
+1. **Replaced JSDOM with regex-based HTML parsing** (-4.3s)
+2. **Removed `@astrojs/vercel` adapter** (-2.5s), moving the sole SSR route to a standalone Vercel API function
+3. **Replaced React comment system with vanilla JS + Convex HTTP actions** (-3s client build)
+4. **Moved Desmos to CDN** (eliminated 2.1MB from Vite bundle)
+5. **Replaced lucide-react barrel imports with deep imports** (-6s client build, 1,719 → 54 modules)
+
+Client JS reduced from **2,470kB** (12 chunks) to **228kB** (8 chunks) — a **91% reduction**.
+Vite client modules reduced from **1,799** to **54** — a **97% reduction**.
+
+## Hyperfine Benchmark Results
+
+All benchmarks: clean build (`rm -rf dist .astro`) each run.
+
+| Configuration                            |           Mean (s) |  Runs |      vs Baseline |
+| :--------------------------------------- | -----------------: | ----: | ---------------: |
+| Baseline (original)                      |     33.760 ± 0.354 |     5 |            1.00x |
+| Phase 1: JSDOM→regex only                |     29.499 ± 0.122 |     5 |     1.14x faster |
+| Phase 1: JSDOM→regex + no adapter        |     27.003 ± 0.329 |     5 |     1.25x faster |
+| Phase 2: + vanilla comments + CDN Desmos |     24.103 ± 0.284 |     3 |     1.40x faster |
+| **Phase 3: + lucide-react deep imports** | **18.291 ± 0.117** | **3** | **1.85x faster** |
+
+## Root Cause Analysis
+
+### Why the build is slow (and why removing 9k lines only saved 10s)
+
+The build had heavy **fixed overhead** that doesn't scale with content:
+
+| Build Phase                     |               Before |              After |   Saved |
+| :------------------------------ | -------------------: | -----------------: | ------: |
+| Vite client build               | ~10s (1,799 modules) | ~0.9s (54 modules) | **~9s** |
+| Vite server entrypoints (Shiki) |                  ~6s |                ~6s |      0s |
+| Static route generation         |                  ~7s |              ~3.5s |   ~3.5s |
+| Content sync + types + overhead |                  ~4s |                ~4s |      0s |
+| Vercel adapter bundling         |                ~2.5s |                 0s |    2.5s |
+
+The 1,799 Vite modules came from the client-side dependency tree:
+
+- **`lucide-react` barrel import** (1,672 modules!) — **replaced with deep imports** (3 modules)
+- `convex` (43MB in node_modules, 125kB bundled) — **removed from client**
+- `react` + `react-dom` (183kB bundled) — **now only loaded on 2 MDX pages**
+- `desmos` (2,110kB bundled) — **moved to CDN**
+- hcaptcha-react, sonner — **removed** (replaced with CDN + vanilla JS)
+
+### The #1 culprit: `lucide-react` barrel imports
+
+Importing `{ RotateCw } from "lucide-react"` forces Vite to **transform all 1,672 icon modules** before tree-shaking can discard them. Switching to deep imports (`lucide-react/dist/esm/icons/rotate-cw`) avoids the barrel file entirely, reducing client build from ~7s to ~0.9s.
+
+### Markdown rendering was NOT the bottleneck
+
+Tested and confirmed:
+
+- Disabling Shiki entirely: only -2s (-6%)
+- Limiting Shiki to only used languages: no measurable effect (lazy-loads)
+- Shiki `defaultColor: false`: no effect (overhead is in WASM tokenizer)
+
+## Changes Made
+
+### 1. Replace JSDOM with regex (`src/pages/[slug].astro`)
+
+JSDOM (4.4MB) was instantiated for every post page to extract `<p>` text and strip HTML.
+Replaced with two regex operations. Saved **4.3s** (27 pages x ~160ms JSDOM init each).
+
+### 2. Remove `@astrojs/vercel` adapter (`astro.config.mjs`)
+
+The Vercel adapter forces `mode: "server"` even for static output, adding redundant server bundling.
+The one SSR route (`/s/[id]`) was migrated to `api/s/[id].ts` as a standalone Vercel serverless function.
+
+### 3. Replace React comments with vanilla JS (`src/components/Comments.astro`)
+
+The React-based Convex comment system (`ConvexProvider.tsx` + `Comments.tsx`) loaded on every page:
+
+- `convex/react` (ConvexReactClient, useQuery, useAction)
+- `@hcaptcha/react-hcaptcha`
+- `sonner` (toast notifications)
+- Full React hydration runtime
+
+Replaced with:
+
+- **Convex HTTP actions** (`convex/http.ts`) — GET/POST endpoints with the same validation, rate limiting, and hCaptcha verification
+- **Pure Astro component** (`src/components/Comments.astro`) — ~60 lines of inline vanilla JS
+- **hCaptcha loaded from CDN** (`https://js.hcaptcha.com/1/api.js`) instead of bundled React wrapper
+
+React is still loaded on the 2 MDX pages that use interactive components (`move2point.mdx`, `mcl-2.mdx`).
+
+### 4. Move Desmos to CDN (`src/tools/move2point.tsx`)
+
+The `desmos` npm package (2.1MB) was only used on one page. Replaced `await import("desmos")` with a CDN script load (`https://www.desmos.com/api/v1.10/calculator.js`), eliminating it from the Vite bundle entirely.
+
+### 5. Replace lucide-react barrel imports with deep imports
+
+`lucide-react` has one ESM module per icon (~1,672 icons). Importing from the barrel file (`lucide-react`) forces Vite to discover and transform all of them, even though only 3 are used. Switching to deep imports:
+
+```diff
+- import { RotateCw } from "lucide-react";
++ import RotateCw from "lucide-react/dist/esm/icons/rotate-cw";
+```
+
+This alone reduced the client build from **~7s** (1,719 modules) to **~0.9s** (54 modules).
+
+## Approaches Tested That Didn't Work
+
+| Approach                               | Result    | Why                                                |
+| :------------------------------------- | :-------- | :------------------------------------------------- |
+| Limit Shiki languages (`langs: [...]`) | No effect | Shiki v3 lazy-loads; only used langs loaded anyway |
+| Shiki `defaultColor: false`            | No effect | Overhead is in WASM tokenizer                      |
+| `vite.build.target: "esnext"`          | No effect | Already targeting modern browsers                  |
+| `react({ include: [...] })`            | No effect | React file detection isn't the bottleneck          |
+| Remove OG image generation             | -0.3s     | Images cached after first build                    |
+| `imageService: false` on adapter       | No effect | Not what makes the adapter slow                    |

api/s/[id].ts

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+import type { VercelRequest, VercelResponse } from "@vercel/node";
+
+export default async function handler(req: VercelRequest, res: VercelResponse) {
+  const { id } = req.query;
+  if (!id || typeof id !== "string") {
+    return res.status(400).send("Bad Request");
+  }
+
+  const blobUrl = `https://${process.env.BLOB_STORE_ID}.public.blob.vercel-storage.com/shares/${id}.html`;
+
+  const response = await fetch(blobUrl);
+  if (!response.ok) {
+    return res.status(404).send("Not Found");
+  }
+
+  const html = await response.text();
+  res.setHeader("Content-Type", "text/html");
+  return res.status(200).send(html);
+}

astro.config.mjs

@@ -1,26 +1,23 @@
 import { defineConfig } from "astro/config";
-import react from "@astrojs/react";
+import solidJs from "@astrojs/solid-js";
 import tailwindcss from "@tailwindcss/vite";
 import rehypeSlug from "rehype-slug";
 import mdx from "@astrojs/mdx";
 import rehypeAutolinkHeadings from "rehype-autolink-headings";
 import sitemap from "@astrojs/sitemap";
-import vercel from "@astrojs/vercel";
 // https://astro.build/config
 export default defineConfig({
   vite: {
     plugins: [tailwindcss()],
   },
   integrations: [
-    react({
-      // include: ["**/*/react/*"],
-    }),
+    solidJs({ include: ["**/tools/**", "**/components/**"] }),
     mdx(),
     sitemap(),
   ],
 
   markdown: {
-    syntaxHighlight: "shiki", // or 'prism'
+    syntaxHighlight: "shiki",
     shikiConfig: {
       themes: {
         light: "github-light",
@@ -51,7 +48,4 @@ export default defineConfig({
   site: "https://www.aadishv.dev",
   base: "",
   output: "static",
-  adapter: vercel({
-    imageService: true,
-  }),
 });