My Frostpunk 2 game starts lagging as my city grows with Corsair LPX DDR4 3200MHz; is this a memory performance issue?

After a five-hour session of city building, I noticed my frame rate slowly bleeding from 60 down to 45, which is a total mood killer for a strategy game. While the Corsair LPX DDR4 3200MHz has enough capacity, severe memory fragmentation caused resource addressing latency to creep up from 12-20ms. I tried the classic 'restart the game' trick, but the lag just came back an hour later, which was a useless temporary fix. I ended up using a memory cleanup tool to defrag the allocation and set the game process to 'High' priority while locking the virtual memory at 16GB. HWInfo showed the effective bandwidth climb back from 32GB/s to a healthy 42-45GB/s. I actually accidentally disabled a critical system service while tweaking priorities and lost my internet connection for a bit, but a quick service restart fixed it. Temps stayed between 40-46℃. After three hours of monitoring, the frame rate is rock solid at 5.1-6.4ms.