The getTickCount() function of AdoScript can be used, that returns the number of milliseconds that have elapsed since the system was started. An example to run a comparison could look like that:
1SET t1: (getTickCount())
2# ... actual script that performs something
3SET t2: (getTickCount())
4# make it to secs
5SET sec: ((t2 - t1) * 0.001)
6CC "AdoScript" INFOBOX ("The computation took " + STR sec + " seconds.")