Yes
wilco77, the OPT does optimise V-Speeds.
Essentially it looks at Runway data and obstacles, and applies the Improved Climb speeds (the first choice). If RTOW is less than the structural limit, it works it's way progressively back to the V2min limit until the RTOW "peaks". If no "performance peak" occurs as the speeds considered reduce, the default is to the Improved Climb performance.
Good timing for your question, I was fielded almost exactly the same question en-route by a F/O only 2 days ago, so my research into the B777 class 3 EFB is recent. A great number of our pilots have the 'mind-set' that Improved Climb' (Dreadful name Mr. Boeing) relates only to the WAT limit,
NOT SO, all performance aspects are considered.
Remember that the annagram OPT for On-board Performance Tool, is also the first 3 letters for
OPTIMIZED, that's what it does.
Regards,
Old Smokey