Currently, in lib/modinfolib.php, we are having below functions that calling obtain_dynamic_data()

- get_url

- get_name

- get_on_click

- get_custom_data

- get_icon_url

- get_user_visible

- is_visible_on_course_page

- get_available

- get_available_info

- obtain_view_data

Also, 

mod_quiz_cm_info_dynamic()

mod_lesson_cm_info_dynamic()

mod_assign_cm_info_dynamic()

will be called in obtain_dynamic_data() by

$this->call_mod_function('cm_info_dynamic');

So, we are having 2 problems here:

1. The dynamic data loading is performing a lot of work here.
2. Some functions, ex: get_on_click() does not need availability information in the obtain_dynamic_data(). So it would be good if we just calculate the availability information if necessary.