LIV's performance is dependent on two things: your own hardware and how well optimized the game you're capturing is.
Minimum specifications for LIV
GPU: Nvidia 1070 or AMD equivalent. CPU: Intel i7 or AMD equivalent.
A minimum spec system might suffer when trying to capture less optimized or more graphically demanding games.
Recommended specifications for LIV
GPU: Nvidia 1080ti or AMD equivalent. CPU: Intel i7 or AMD equivalent.