The .exe version contains the Java edition required to play. Inno purposefully uses an older version of Java.
If it is performance you are after, Loliphile makes a version that has some fairly obvious changes, but is also cleaner and assembled better. Those changes are not mandatory content.
That 'vaguely' is hiding the part where it was, and still is, on the to-do list.
It comes down to two things: choice and visualization.
With CoC and TiTS, you can only do what is written in (only the most profound revelations to be found here). So while the sex scenes are far more descriptive, you are on tracks for the duration.
With LT, you can do so much more with so many more, but that means the sex scenes have to be written in a way that lets you do anything with anyone.
While you need the ability to visualize - to rotate the apple-bottoms, as it were - for both games, LT needs it far more, because otherwise you are just kind of knocking Barbie and Ken dolls together with about as much satisfaction.