R Under development (unstable) (2023-10-28 r85429 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> main <- function ()
+ {
+     FILE <- tempfile(fileext = ".R")
+     on.exit(unlink(FILE), add = TRUE)
+     this.path:::.write.code(file = FILE, {
+         if (requireNamespace("microbenchmark")) {
+             invisible(loadNamespace("microbenchmark"))
+             invisible(loadNamespace("this.path"))
+             print(this.path:::.faster.subsequent.times.test())
+         } else cat("\n'package:microbenchmark' is not available :(\n")
+     })
+     cat("\n")
+     this.path:::.Rscript(c("--default-packages=NULL", "--vanilla", FILE))
+ 
+ 
+     cat("\n> source(FILE, chdir = FALSE)\n")
+     source(FILE, chdir = FALSE)
+ 
+ 
+     cat("\n> source(FILE, chdir = TRUE)\n")
+     source(FILE, chdir = TRUE)
+ }
> 
> 
> main()

"D:/RCompile/recent/R/bin/x64/Rscript.exe" "--default-packages=NULL" "--vanilla" "D:\temp\Rtmpu6RkJa\file2056c29073791.R"
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq   mean median    uq   max neval
 first time 764.5 764.5 764.50  764.5 764.5 764.5     1
 subsequent   4.7   4.8   4.95    4.8   4.9  13.9   100

> source(FILE, chdir = FALSE)
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 602.6 602.6 602.600  602.6 602.6 602.6     1
 subsequent   5.9   6.0   6.251    6.1   6.2  20.2   100

> source(FILE, chdir = TRUE)
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 585.3 585.3 585.300  585.3 585.3 585.3     1
 subsequent   6.0   6.1   6.355    6.2   6.2  21.7   100
> 
> proc.time()
   user  system elapsed 
   0.29    0.07    0.64