Fallout 3
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Increase performance by changing the initial heap size allocated by the game (similar to DefaultHeapInitialAllocMB in NVSE), from 200MB to 400MB.

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Increases the initial heap size to 400MB (Vanilla is 200MB).
Heap size is customisable in the INI, capped at 768MB.

Should help reduce lag when opening inventory and pipboy menus.

Included in lStewieAl's Tweaks

Use Mod Organizer 2/Nexus Mod Manager/FOMM, or manually extract the .zip file into your Fallout 3 'Data' folder.

Credits to RoyBatty