Infrastructure for Speed

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// api/chat/route.ts - Edge function for AI chat
import { OpenAI } from 'openai';
import { Redis } from '@upstash/redis';

export const runtime = 'edge'; // Deploy to 200+ edge locations

const openai = new OpenAI();
const redis = Redis.fromEnv();

export async function POST(req: Request) {
  const { messages, sessionId } = await req.json();
  

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// Vercel Edge Function with OpenAI streaming
import { OpenAIStream, StreamingTextResponse } from 'ai';
import OpenAI from 'openai';

export const config = {
  runtime: 'edge', // Run at the edge for lowest latency
};

const openai = new OpenAI();

export default async function handler(req: Request) {
  const { messages, userId } = await req.json();

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import { OpenAI } from 'openai';
import { Index } from '@upstash/vector';

const openai = new OpenAI();
const vectorIndex = new Index();

const SIMILARITY_THRESHOLD = 0.95;
const CACHE_TTL = 3600; // 1 hour

async function semanticCache(
  query: string,
  generateFn: () => Promise<string>

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// app/api/chat/route.ts
import { OpenAIStream, StreamingTextResponse } from 'ai'
import OpenAI from 'openai'
import { Redis } from '@upstash/redis'

const openai = new OpenAI({ apiKey: process.env.OPENAI_API_KEY })
const redis = Redis.fromEnv()

export async function POST(req: Request) {
  const { messages, userId } = await req.json()
  
  // Rate limiting check

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// lib/ai-providers.ts
interface AIProvider {
  name: string
  isHealthy: boolean
  latencyP99: number
  complete(messages: Message[]): Promise<AsyncIterable<string>>
}

class AIProviderManager {
  private providers: AIProvider[] = []
  private healthCheckInterval: NodeJS.Timeout
  

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// lib/speed-stack.ts
import { Redis } from '@upstash/redis'
import { Ratelimit } from '@upstash/ratelimit'
import { OpenAI } from 'openai'
import { Anthropic } from '@anthropic-ai/sdk'

// 1. Multi-layer caching
const redis = Redis.fromEnv()
const browserCache = new Map<string, { data: string; timestamp: number }>()

// 2. Rate limiting with sliding window
const ratelimit = new Ratelimit({