how to measure client performance & info sent to server in case of dealing with huge data to be showed correctly in the client side dynamically

i m using rpc using event-source, i need to push huge data to the
client side and measure the performance and send back the information
to the server side for adjusting the delay time(of event source rpc)
according to the measured info. How to measure the client performance.
How to make buffer in client side so that in client side it can
smoothly show the data (eg. array values in graph (x,y) (x1,y1)..) and
hold some data in its buffer.

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