[4.379] T-72B3 TC position dramatic FPS drop

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T-72B3 TC position appears to have a dramatic FPS drop inherent to it when viewed from inside, and even when unbuttoned likely having to do with PIP screen rendering.

I compared it to M1A2SEP also with PIP thermal screens and the T-72B1 as a control.

Map used is ScaniaSE (2nd one), I could not reproduce an FPS drop on the default map, likely due to there not being anything of note to render in the PIP screens.