Why does The Sims 5 stutter during building with G.Skill RAM?

Rendering complex buildings created a massive CPU bottleneck where some cores hit 100% while others just sat idle. I tried setting the Windows power plan to High Performance, but while P-Cores responded faster, E-Core latency remained, which was incredibly frustrating. I used the GamePP BIOS Load-Line Voltage Adjustment Guide to set LL to L2 mode and adjusted VCCSA to 1.25V. Cinebench R23 scores rose to 35200, and HWInfo showed core temperatures evenly distributed at 74-80℃ with a stable 4000MHz clock via AIDA64.