How can i calculate execution time in node red?

calculate the program speed (start and end )

Have a look at node-red-contrib-msg-profiler
It hasn't been published on npm, so to install it, run the following npm command in your Node-RED user directory (typically ~/.node-red):

npm install bartbutenaers/node-red-contrib-msg-profiler

And if you want something simple (a paste into your flow type addition) then there is this...

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