R Under development (unstable) (2024-12-17 r87446 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", quietly = TRUE)) {
+             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\2024_12_18_01_55_17_12850\RtmpIroi9b\file128a86eec3383.R"
Unit: microseconds
       expr    min     lq     mean median     uq    max neval
 first time 1043.8 1043.8 1043.800 1043.8 1043.8 1043.8     1
 subsequent   10.3   10.4   10.832   10.5   10.6   36.1   100

> source(FILE.R, chdir = FALSE)
Unit: microseconds
       expr   min    lq   mean median    uq   max neval
 first time 730.5 730.5 730.50  730.5 730.5 730.5     1
 subsequent  19.5  22.9  23.73   23.7  24.5  56.6   100

> source(FILE.R, chdir = TRUE)
Unit: microseconds
       expr   min    lq    mean median    uq   max neval
 first time 263.2 263.2 263.200  263.2 263.2 263.2     1
 subsequent  11.1  11.3  11.826   11.4  11.5  47.8   100
> 
> proc.time()
   user  system elapsed 
   0.34    0.06    0.71