Update src/toplevel_generators.jl

Co-authored-by: Mosè Giordano <[email protected]>

Author: vchuravy

src/toplevel_generators.jl

@@ -163,6 +163,8 @@ function generate_wrapper_load(src_name, pkg_uuid, __source__)
                 end
 
                 # From the available options, choose the best wrapper script
+                # The two argument `select_platform` is notably slower, so micro-optimize this by
+                # only calling it when necessary.
                 if host_platform !== nothing
                     select_platform(valid_wrappers, host_platform)
                 else