Why Direct3D is more faster than OpenGL at this moment? (Rev. 5017)

[Dynam0]

Actually, OpenGL plugin have some gfx bugs, glitches and slowdowns.

I am a nVidia user and using Direct3d plugin i have good gfx and +20-30% speed in all the games (In other words, al the supported games run 98% perfect).

Is this a bad plugin, Direct3D is better or the developers preffers D3D and forgot OpenGL?

It's only a question.

Thank You.