#4 Bug - Low FPS when a complex menu is opened

[Shade W]

Action taken:
Access province info menu for a province that has two groups of troops of the same type.
Open the transfer menu between the two groups.
Expected result:
The FPS is at least 30.
Actual result:
The FPS is very low (8 FPS) - BUG
Note:
This is happening only on some machines while on others it is ok and the hardware configuration it is at least the same on both the ones that have a good FPS and the others that don't.