Currently when I bring up the local magit log ("l l") it takes a fair amount of time. It would be nice for the log just to limit itself to the nearest merge base (e.g. vs origin/master) but I haven't been able to work out how to do this.
magit-log accepts an optional
range argument. You can also do
l r l followed by
origin/master and then
In Magit 2.x you can use
l o to the same effect. In this case you would specify a range using standard git range specifiers (typically the 'double-dot' notation):