The JVM already only loads classes on demand so if you don't use Corba it doesn't have any impact on you (maybe minuscule extra seek time reading the JAR).
The jar files used to be memory mapped, and as far as I'm aware they still are. So there should be a noticeable improvement in seek time by eliminating never-used files.
You could also perhaps be looking at a situation in the future where the JRE can selectively exclude things at install time, which would be nice.
You could also perhaps be looking at a situation in the future where the JRE can selectively exclude things at install time, which would be nice.