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profile

Definition: profile(bool bOn)
Description: Enable or disable profiling at run-time. This works for both execution-count and time-profiling.
If bOn is true(1) then profiling will be enabled, and samples/counts will be recorded.
If bOn is false(0) then profiling will be disabled and samples/counts will not be recorded.

An ex.pro file containing a special listing of your program is produced by the interpreter when the program finishes execution.
pwa/p2js: Not supported. It would of course be rather difficult for the browser to write an ex.pro file.
Comments: After a with profile or with profile_time statement, profiling is turned on automatically.
Use profile(0/false) to turn it off.
Use profile(1/true) to turn it back on when execution reaches the code that you wish to focus the profile on.

Profiling does not apply to inline assembly (#ilASM{}), only hll code.

The comments in the technicalia drop-down on the trace documentation apply equally to profiling.
Example 1: 
profile(0)
  ...
procedure slow_routine()
profile(1)
  ...
profile(0)
end procedure
Implementation: via :%opProfile in builtins\VM\pProfile.e (an autoinclude/part of the compiler).
See Also: trace, profiling, special top-level statements