Doubts over the Performance in Developing a Chat application

We are developing a chat application which needs to update the chat content in the database for the duration of the chat (ie.,For the duration of a session).At the same time the page should refresh and show the current content on both ends.In addition to both these, the database tables has to be checked to detect the occurence of a Network error on both sides.
We have developed it as a Browser based chat and we have used PHP with MySQL. The performance is slow.
Can anyone give a suggestion as to whether we can develop the chat application completely from the scratch and if we do that which technology should we choose to boost the performance.
If anyone is not clear about my problem just mail me.I'll explain it in more detail.
Thanks in Advance

Hi,
I just wanted to know these following answers.
2) Network failure -- Means (either browswer got killed or data did not arrived/Page Not refreshed)
3) which WebSErver are U using?
From java, it is very easy to develop chatting application for which you can use applet and servlets for the same (if you consider the performance is the utmost importance)
Updating to the database should not be done for the duration levels rather should be done at the event levels(data change/keyboards/session -inf changes).
Im not sure about PHPs running at client but I can suggest you to use two frames .One is for typing and other one is for displaying information which basically gets the staus from the server abt other users in the chat either from the session, which would be driven by other component which is static) .
Any how, I just put my ideas (Im sure , you know all these things)
with regards
Lokesh T.c

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Doubts over the Performance in Developing a Chat application

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