Btop - What is the LAV value mean?

I have a KVM guest and inside it I am running vnc server. I have a ssh tunnel that I connect to it using tigervnc viewer. Everything works good for it except one issue. Using Chrome (using X server), when I vertically scroll on a website it is a bit laggy. I checked the cpu and it looks good, I never see it at 100%... at most 50%. Memory is good to... I usually have about 30 gigs free of ram. However, I see the first LAV value is 1.88 on btop. What does that mean exactly? Does that mean 100 percent of the cpu is being used and 88 percent of processes are waiting?