Hi Nitin,
By looking at your problem I am assuming that you are trying to configure historical trends.
If yes there can be two issues here.
1. Archiving frequency
2. Viewing period
when you navigate to a screen on which trend is configured, HMI try to update the screen on open even. In your case it will try to update data from you CSV file which is stored on your card and in which you are logging your process variable.

You improve your time you got to reduce the archiving frequency (in tag property, logging section)
other thing you got to do is total viewing time on the trend (Trend Property -> X-Axis -> Time Interval)
Both of above will help you in reducing the number of data to be extracted from log. This will improve updating time.

Other thing you can try is for each tag configures different logs.
Regards,
Kuntal Desai