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\RtmpySPMmy\file36b423b08fb.R"
Loading required namespace: microbenchmark
Unit: microseconds
       expr      min       lq       mean   median        uq      max neval
 first time 1043.802 1043.802 1043.80200 1043.802 1043.8020 1043.802     1
 subsequent    9.300    9.401    9.80899    9.501    9.6005   33.201   100

> source(FILE.R, chdir = FALSE)
Loading required namespace: microbenchmark
Unit: microseconds
       expr     min      lq      mean  median      uq     max neval
 first time 878.301 878.301 878.30100 878.301 878.301 878.301     1
 subsequent  10.901  11.001  11.40998  11.101  11.200  37.801   100

> source(FILE.R, chdir = TRUE)
Unit: microseconds
       expr     min      lq      mean  median      uq     max neval
 first time 573.702 573.702 573.70200 573.702 573.702 573.702     1
 subsequent  10.900  11.101  11.57696  11.201  11.301  41.401   100
> 
> proc.time()
   user  system elapsed 
   0.34    0.01    0.68