How to fix high memory usage lag in Horizon Zero Dawn?

I was deploying armored clusters in Horizon Zero Dawn when the system froze. The background memory hit 8.5-10.2GB per Task Manager, causing 9.2-13.5ms frame time jitter. I tried clearing temp files, but it made no difference. I then used GamePP Resource Scheduler to set the process to Real-time priority. AIDA64 showed the frame interval stabilizing to 5.8-6.9ms, and temperatures stayed at 45-52°C. This fix finally saved my gameplay session.