Why does Fortnite stutter during rapid building on X99M-PLUS D4?

I felt absolute despair during intense gunfights when my screen started twitching during rapid building. I tried forcing XMP mode in the BIOS, but my system fell into an infinite reboot loop, proving the motherboard's poor compatibility. To fix this, I used the GamePP Resource Scheduler to set the game process priority to Realtime and suppressed three memory-heavy background services. RTSS monitoring showed frame times converging from 18-32ms to 8-12ms, while AIDA64 confirmed memory temperatures stabilized at 54-58℃.