R Under development (unstable) (2023-12-09 r85665 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\RtmpsTRPyN\file387c3a3432d6.R"
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 838.6 838.6 838.600  838.6 838.6 838.6     1
 subsequent   4.7   4.7   4.957    4.8   4.9  16.6   100

> source(FILE, chdir = FALSE)
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 620.1 620.1 620.100  620.1 620.1 620.1     1
 subsequent   5.9   6.1   6.768    6.2   7.1  21.5   100

> source(FILE, chdir = TRUE)
Unit: microseconds
       expr min    lq mean median    uq   max neval
 first time 508 508.0  508  508.0 508.0 508.0     1
 subsequent   6   6.1    7    6.3   6.8  20.4   100
> 
> proc.time()
   user  system elapsed 
   0.35    0.04    0.70