1. I find the current lag in postings to be very detrimental to the whole concept and usefulness of Twitter. If there is a 20 minute delay between the time I post something and everyone else seeing it, then it's at least 40 minutes before I can see anyone's response to what I say. This can be particularly debilitating when we are relying on Twitter at conferences or to stay in touch when meeting up.
2. There are parts of Twitter that eat performance but in my mind, serve no useful purpose. The matrix of tiny avatars to the right of the Tweet listing is of no use to me because they are not arranged in any useful or understandable order and it doesn't show them all anyway. I'd say get rid of it if it would help performance.
3. Do you have any information about why Twitter just can't seem to make their site work properly and with good performance? This is not exactly untrodden ground. There are lots of very smart people who know how to performance engineer a site so it runs fast. Is it the SMS gateways that are the problem? WHAT IS IT? I so wish they would just level with us.
Please comment on these questions or add your own thoughts. What would you like to see changed, added, improved or removed?