Why does Dragon Age: The Veilguard keep dropping frames during chaotic combat with Kingston DDR3 1866?

Whenever I cast massive spells, I hit these weird 15-28ms hitches that absolutely kill the flow. The default timings on this Kingston DDR3 1866 kit are way too loose for modern engine instruction streams, leaving the memory controller just idling during address jumps. I tried bumping the page file to 16GB first, but that was a total waste of time; it didn't stop the stutters and actually added 4 seconds to my boot time. I eventually dove into the BIOS Advanced Memory settings and squeezed tRCD and tRP down from 11-11 to 10-10, while nudging the voltage from 1.50V to 1.55V. AIDA64 showed my read latency dropping from 85-92ns down to a much tighter 74-80ns. It wasn't a smooth ride, though—the first time I tightened the timings, I got a BSOD during scene loads. I had to loosen tRFC to 260 before it actually stayed stable. Temps sat around 42-48℃ for the sticks and 58-64℃ for the VRMs. CPU-Z confirms it's rock steady at 1866MHz with zero errors.