If the website haveing 70 XHR endpoint in that one is taking more time for that alone how i can see the trent or how to store the historical data ?
i think you may be asking if the TCP waterfall chart displays XHR requests - it may, you would need to check an active transaction monitor against the site. Open the TCP waterfall chart in fullscreen to see if it was captured. Unfortunately TCP waterfall is not captured historically, it is an active feature request - vote here.