Qt GUI with rviz

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Hi! I am currently developing a ROS GUI with Qt. In this GUI I use Rviz render panels to incorporate some of Rviz functionalities to my GUI. To achieve this I follow the ROS tutorial:
http://wiki.ros.org/rviz/Tutorials/Li...

The problem comes when I create two instances to visualize two render panels as the same time. I’ve found that the instances are not running on my GPU so my GUI slow down and it crashes, for example, when I try to access to the file system to load a file. I notice that it doesn’t happen when I run Rviz as standalone. Are there any way to fix that problem? Thanks.