Subtitle list cache

When navigating to the subtitles menu, it requests the list of subtitles from the subtitles service (OpenSubtitles for myself). This takes up to 30 seconds sometimes.
Would it be possible to add a feature that the user will be able to ask for the list to be retrieved and cached right when the movie starts to load and later be re-used? As it is now the list is being retrieved EACH time the subtitle menu is accessed. The list does not really changed, but it the chosen subtitles is no good, another 30 seconds are wasted waiting to the list.