If the original files are m2t, try rendering to HDV m2t 1440 x 1080, and playing with VLC. It’s a free player and may be more efficient than media player. Here’s a link for the free player. https://www.videolan.org/vlc/ Hope this helps, Danny
You can also try converting the m2t file to a Cineform avi, which is way easier on the CPU. Comes fre with Vegas pro7 and 8 I know. I heard 9 discontiued it.
My card only plays VIDEO on a select primary screen. If your card plays video on all 3 at the same time, Let me send you a small clip that should do what you want. What’s your email address?
I have a Matrox Parhelia APVe card that also shows 3 screens as one desktop, I assume that’s what your doing. I gather you want media player to play full screen on the three projectors and will use your computer to source these via VGA connections. If it’s not let me know. Let experiment a little when I get home to my computer and see what I can do. Danny