Slow navigation: keyboard vs. mouse, direct access vs. menu

Hi,

we did a stress test on our system and have found that when we have a high number of users:

- Under normal load it takes about 2 seconds to open a forms like SGASTDN.
Under high load this will go up to 30 seconds, when you enter the form name into the "Go To" box,
but it only takes about 5 seconds, when you select it from a menu.

- Moving from field to field within a form, like SGASTDN, is instant when using the mouse,
but using the keyboard and tabbing through the fields, there can be a delay of a few seconds.
The delay seems to increase with the complexity of the form.

Has anybody else experienced this?

Stefan