Why does my Fanxiang S910Max 1TB cause FPS to drop to 28 during massive battles in Space Marine 2?

Fighting waves of Tyranids was like watching a slideshow; the frame drops were absolutely brutal. The Fanxiang S910Max's 4K random reads were being pushed to the limit, with load curves spiking between 72-96%, making the engine choke while loading unit models. I tried dropping all settings to low, but the game looked like a blurry mess, which felt like a joke of a solution. Instead, I used a tool to kill the Windows Search real-time indexing and shut down three useless background backup processes. In the RivaTuner frame time graph, the jagged spikes finally flattened out, with frame generation stabilizing at 11-14ms. To be fair, after killing the index, searching for files became painfully slow until I manually rebuilt the index for my key folders. SSD temps were a cool 44-51℃. I exported the read/write peak data via monitoring software, and fans stayed steady at 1400-1600RPM.