Useless bytes are never welcomed so if the plug-in size could be reduced easily, it would be a nice gain.
By the way, larger DLLs means also more time to extract and load them at the launch of the first rendering.

Correct! But, it's the wrong priority to search for useless bytes while the plug-in is not fully functional yet.
And it's totally the wrong priority if the plug-in is 12MB and not 120MB.
But as written bevore, this is only my opinion...