use sendwhatmsg_instantly() instead of sendwhatmsg() function.
After that ctrl+click on sendwhatmsg_instantly() function, it will open the source code.
In sendwhatmsg_instantly() function, change the the time.sleep() value.
ie time.sleep(15). And thats it!
The same problem is faced with the original function as well. You can change sleep time in that as well.

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