The full source filenames are now cached and added whenever they are available (e.g. when the identifier parser finishes or when the project units parser does not use the map file but the dpr), so they rarely need to be searched for again. This speeds up updating the status bar quite a lot and prevents the annoying lags when scrolling through the lists which was previously caused by the search.
I haven't tried it on a slow computer yet, but I am confident that this change makes quite a difference there too.