R Under development (unstable) (2023-08-11 r84935 ucrt) -- "Unsuffered Consequences"
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> library(copent)
> library(mnormt)
> rho1 <- 0.5
> rho2 <- 0.6
> rho3 <- 0.5
> sigma <- matrix(c(1,rho1,rho2,rho1,1,rho3,rho2,rho3,1),3,3)
> x <- rmnorm(500,c(0,0,0),sigma)
> ci1 <- ci(x[,1],x[,2],x[,3])
> 
> proc.time()
   user  system elapsed 
   0.42    0.12    0.53