input: Write a function to optimize a Flask application for efficient performance. The function should implement the following strategies: use Redis for caching session and query performance, use uWSGI for Python applications, use gunicorn as WSGI server, use Flask-Compress extension for compression, use global variables where applicable, don't use SQL queries directly (always use model methods), use query parameters in URLs instead of plain parameters, and use thread-local objects for performance.
  
  def optimize_flask():
      from flask import Flask, request, jsonify
  
      app = Flask(__name__)
  
      @app.route('/api/<endpoint>', methods=['GET', 'POST'])
      def process_request(endpoint):
          # Implementation of performance optimizations
          pass  # Your code here
  
      return app
  
  # Example assertions to test the function
  
  # Expected output: A Flask application object optimized for performance
  assert optimize_flask() != None
output: def optimize_flask():
      from flask import Flask, request, jsonify, g
      from flask_compress import Compress
      import redis
  
      app = Flask(__name__)
      Compress(app)
  
      redis_client = redis.StrictRedis(host='localhost', port=6379, db=0)
  
      @app.before_request
      def before_request():
          g.redis = redis_client
  
      @app.route('/api/<endpoint>', methods=['GET', 'POST'])
      def process_request(endpoint):
          if request.method == 'GET':
              cached_data = g.redis.get(endpoint)
              if cached_data:
                  return jsonify(cached_data)
              # Use model methods instead of direct SQL queries
              result = model_method(endpoint)
              g.redis.set(endpoint, result)
              return jsonify(result)
          elif request.method == 'POST':
              data = request.get_json()
              # Use model methods instead of direct SQL queries
              result = model_method(endpoint, data)
              g.redis.set(endpoint, result)
              return jsonify(result)
  
      return app