A slow address is usually a busy address or a bad circuit, not a broken one. The board's advice is to switch rather than wait.
Why it slows
Under a flood, the anti-DDoS queue holds you longer by design, so the login behind it is not overwhelmed. A congested Tor path on your side has the same effect. Neither means the market is failing.
What to do
Move to another address in the pool and try that. Build a fresh circuit for a second attempt on the original. One of the three usually clears quickly. Verify whichever you land on.
When it is wider
If all three are slow at once across fresh circuits, a flood window may be in progress. The incident log records these. They pass.