How to increase sqlite performance

I want to increase sqlite performance. Tried this

class SqliteSettingsMiddleware(object):

    def process_request(self, request):
        cursor = connection.cursor()
        cursor.execute("PRAGMA threads = 2")
        cursor.execute("PRAGMA page_size = 2048")
        cursor.execute("PRAGMA temp_store = MEMORY")
        cursor.execute("PRAGMA default_cache_size = 20000")

But I think it is not increasing performance. My concern is with faster reading speed. Can someone tell me I am doing it right.???