R Under development (unstable) (2024-06-28 r86850 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\RtmpOs7TyE\filef3c84b85785a.R"
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 812.0 812.0 812.000  812.0 812.0 812.0     1
 subsequent   9.3   9.5   9.809    9.5   9.6  30.9   100

> source(FILE.R, chdir = FALSE)
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 597.5 597.5 597.500  597.5 597.5 597.5     1
 subsequent  11.0  11.1  11.471   11.2  11.3  34.1   100

> source(FILE.R, chdir = TRUE)
Unit: microseconds
       expr min    lq    mean median    uq   max neval
 first time 549 549.0 549.000  549.0 549.0 549.0     1
 subsequent  11  11.1  11.393   11.2  11.3  27.9   100
> 
> proc.time()
   user  system elapsed 
   0.29    0.04    0.65