add notes about using racket/base instead of racket. closes pr 10992

collects/scribblings/guide/scripts.scrbl

@@ -19,6 +19,10 @@ remainder of the first line must be a command to execute the script. For
 some platforms, the total length of the first line is restricted to 32
 characters, and sometimes the space is required.
 
+@margin-note{Use @racketmodfont{#lang} @racketmodname[racket/base] instead
+of @racketmodfont{#lang} @racketmodname[racket] to produce scripts with a
+lower startup time.}
+
 The simplest script format uses an absolute path to a @exec{racket}
 executable followed by a module declaration. For example, if
 @exec{racket} is installed in @filepath{/usr/local/bin}, then a file

collects/scribblings/raco/exe.scrbl

@@ -5,6 +5,11 @@
 
 @title[#:tag "exe"]{@exec{raco exe}: Creating Stand-Alone Executables}
 
+@margin-note{Use a smaller base language to achieve a lower startup time such as
+@racketmodfont{#lang} @racketmodname[racket/base] instead of
+@racketmodfont{#lang} @racketmodname[racket] rather than relying on @exec{raco
+exe}.}
+
 Compiled code produced by @exec{raco make} relies on Racket
 executables to provide run-time support to the compiled code. However,
 @exec{raco exe} can package code together with its run-time support to