For heavy scraping and multithreaded jobs, addresses from open lists fail on the first requests. A closed pool with SOCKS5 and HTTP keeps the load steady. For tasks like these, it makes sense to take private addresses with spare threads. Pool and plans: https://telegra.ph/Rotating-proxies-for-web-scraping-staying-under-rate-limits-10-21 Plans cover 1,000, 3,000 and 5,000 threads. There is a free test of up to 2 hours before you pay. For high speed proxy the pool runs from the first launch.