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baidigang: DDR2, DDR3, DDR4?
Textures are stored in vRAM.
Use most overhauled map and type commands "memory" and "tris" or "3d" in console and post here results. You can post s2.exe memory ussage from taskmanager aswell.
Which game version are you using? (engine sided, modded or the vanilla Gold one)
BlitzBasic is very old, and it results in lags and slow perfomance, doesn't matter RAM and VRAM size