When should you use Line Loop and is there a max limit to number of lines is can work with?

While there is no technical upper limit to how many lines you can have a line loop iterate a rule of thumb is that if you have more 50 lines you should seriously evaluate if the line loop is the right tool for your job or you should be using custom development. Line loop a very dynamic system and the drawback of such a system is performing. So essentially Line Loop was created with the small number of lines in mind and while it might work on a large number of rows we can't guarantee slowness and timeouts.