R Under development (unstable) (2024-02-15 r85925 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> local({
+     FILE.R <- tempfile(fileext = ".R")
+     on.exit(unlink(FILE.R), add = TRUE)
+     this.path:::.writeCode(file = FILE.R, {
+         if (requireNamespace("microbenchmark")) {
+             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.R))
+ 
+ 
+     cat("\n> source(FILE.R, chdir = FALSE)\n")
+     source(FILE.R, chdir = FALSE)
+ 
+ 
+     cat("\n> source(FILE.R, chdir = TRUE)\n")
+     source(FILE.R, chdir = TRUE)
+ })

"D:/RCompile/recent/R/bin/x64/Rscript.exe" "--default-packages=NULL" "--vanilla" "D:\temp\Rtmp6NfQuv\filea8902e1c22c2.R"
Loading required namespace: microbenchmark
Unit: microseconds
       expr    min     lq     mean median     uq    max neval
 first time 1774.4 1774.4 1774.400 1774.4 1774.4 1774.4     1
 subsequent   15.5   16.2   17.144   16.4   16.9   69.1   100

> source(FILE.R, chdir = FALSE)
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 866.6 866.6 866.600  866.6 866.6 866.6     1
 subsequent  16.9  18.1  18.759   18.2  18.4  66.1   100

> source(FILE.R, chdir = TRUE)
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 628.3 628.3 628.300 628.30 628.3 628.3     1
 subsequent  17.2  18.1  19.721  19.15  20.1  64.9   100
> 
> proc.time()
   user  system elapsed 
   0.39    0.12    0.93