My textures are failing to load in stealth sections of MGS Delta on a GW3300. How do I fix this?

Sneaking through the jungle and suddenly the ground textures turn into these blurry, low-res blobs—it's a total immersion killer. Since the Great Wall GW3300 is only 256GB, once I hit 85% capacity, the SLC cache basically gave up, and random read latency spiked to 110-145ms. I tried clearing 10GB of temp files first, but the textures kept popping in and out; it was clear that a surface-level cleanup wasn't touching the actual bottleneck. I ended up using a partition manager to leave 30GB as unallocated space to give the controller more breathing room for garbage collection, and I updated the motherboard storage drivers. In AIDA64, my read latency dropped from 120ms to 55-62ms, and the textures finally loaded instantly. I actually bricked my boot partition while trying to shrink the volume the first time and had to run disk repair just to get back into Windows. Now the drive stays between 40-48℃ and is rock steady. System logs show zero I/O errors, and my RAM temps are hovering around 58-63℃.