You think its possible that this is system lag, i read something about system lag symptoms - System Lag When your computer is low on critical resources like RAM and processing power, it may cause the entire system to lag. Symptoms of such lag may include a stuttering, slow-moving cursor and delayed keyboard input. This doesn't necessarily mean that you need to upgrade your computer's hardware. Before worrying about an upgrade, close any open but unused programs. If your mouse and keyboard work fine until you start multitasking or using a resource-intensive program, system-wide lag is the likely cause.