R Under development (unstable) (2023-09-11 r85126 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("\npackage {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\RtmpYB7vn2\file2799038da18ce.R"
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq    mean median     uq   max neval
 first time 864.9 864.9 864.900  864.9 864.90 864.9     1
 subsequent   4.6   4.7   4.917    4.8   4.85  14.5   100

> source(FILE, chdir = FALSE)
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 579.4 579.4 579.400 579.40 579.4 579.4     1
 subsequent   5.8   5.9   6.119   5.95   6.0  19.7   100

> source(FILE, chdir = TRUE)
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 468.3 468.3 468.300  468.3 468.3 468.3     1
 subsequent   5.8   5.9   6.289    6.0   6.1  18.8   100
> 
> proc.time()
   user  system elapsed 
   0.28    0.03    0.65