One of my users has mentioned that the Conversation feature of Pulse not being "Live" (that is, requiring fresh page loads to show new comments) and slow page loading + difficult scrolling often result in the users involved resorting to an outside chat tool to actually have the conversation... so the conversation doesn't get captured in Pulse and the Conversation feature fails to accomplish its purpose.
A "live chat" widget that shows incoming messages without requiring a page refresh would make the Conversation feature of Pulse vastly more usable, with or without addressing other performance issues (scrolling and slow loads). If the goal is to capture the actual Conversation... this is pretty critical.