I'm curious, what makese the onionsite either work almost as fast as clearnet, or be slow as dial-up/ not even load pages? I'm interested in this technology.
Hopping around multiple random nodes and relays around the world causes severe latency. There's time spend encrypting and decrypting data. Nodes and relays are also under attack regularly and DDOS attacks still occur on TOR. Darket markets are usually DDOS'd by competitors and those looking for a payout to stop which slows the entire network.