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\RtmpkTK4hj\filed95034185531.R"
Loading required namespace: microbenchmark
Unit: microseconds
       expr     min      lq      mean  median      uq     max neval
 first time 796.601 796.601 796.60100 796.601 796.601 796.601     1
 subsequent   9.301   9.401   9.71502   9.501   9.601  24.301   100

> source(FILE.R, chdir = FALSE)
Loading required namespace: microbenchmark
Unit: microseconds
       expr   min    lq      mean  median      uq     max neval
 first time 629.7 629.7 629.70000 629.700 629.700 629.700     1
 subsequent  10.9  11.1  11.45999  11.101  11.201  39.401   100

> source(FILE.R, chdir = TRUE)
Unit: microseconds
       expr     min    lq      mean  median      uq     max neval
 first time 573.600 573.6 573.60000 573.600 573.600 573.600     1
 subsequent  10.901  11.1  11.35001  11.101  11.201  28.101   100
> 
> proc.time()
   user  system elapsed 
   0.28    0.06    0.65