Do you have a "More tweets" section under the main tweet? I have one, and I imagine that that is both generated on-the-fly and tailored to my browsing behavior.

Do you have a "More tweets" section under the main tweet? I have one, and I imagine that that is both generated on-the-fly and tailored to my browsing behavior. So it probably interrogates a larger system, adding latency. I'd bet as well that there is some fetching of 'live' quote/retweet/like counts, that probably occurs in some kind of interval.