https://bugs.freedesktop.org/show_bug.cgi?id=37142
--- Comment #2 from Marek Olšák maraeo@gmail.com 2011-05-12 12:55:38 PDT --- (In reply to comment #0)
What do you think ?
You can't optimize the uploads because the sizes of all buffers are not known when glLockArraysEXT is called. The only things you've got are pointers to the buffers.