Question #171253 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/171253
Status: Open => Answered
RaiMan proposed the following answer:
This is a historical oddity in the API.
The first parameter to many of the Sikuli functions is PSMRL, which stands for
the options
P - Pattern, S - String, M - Match, R - Region, L - Location.
Only for PS it is more efficient to use a restricting region, since this
makes the search faster (up to ten times and more):
reg.click(PS) instead of click(PS)
which implicitly binds to SCREEN ( constant object Screen(0) ) and so
searches the whole screen.
Using click(MRL) or reg.click(MRL) does not matter in sense of performance,
since MRL already define a click point by there object contents (no time
consuming search necessary). And in both cases, the click() is bound to a
Region object, so no difference (in case click() it is the region SCREEN).
So using reg.click(MRL) only makes sense for documentation/code readability:
saying, look I am clicking somewhere inside this region.
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