This topic was specific on tdsls4201s000.
But indeed many sessions could have issues and many solutions have been made. As this answer was from 2005, I recommend to start a new topic if you have sessions that are not performing well.
And of course, read solution 22881401 as it has lots of ideas on how performance can be measured, traced and improved.
BTW: this post has been made on my personal view. My employer might not share my point of view.