Why does GTA V roleplay have high input lag, and should I use a resource scheduler for Corsair RAM?

My character movement in GTA V / FiveM felt unresponsive, with latency spiking to 45ms and jagged memory usage curves on my Corsair Vengeance LPX DDR4 3600MHz. I tried manually ending background processes in Task Manager, but that only made the frame drops worse and caused more stutter. I needed a more robust solution. I used GamePP Resource Scheduler to set the game process priority to Highest and disable non-essential background services. RTSS monitoring showed the frame generation time stabilizing from 30-48ms to a consistent 18-22ms.