I concur however @sreelakshmi25996 was keen to have it encrypted - I assume the problem he is solving for is a shared mqtt broker where you don’t trust the clients and you want to encrypt certain payloads
Anyway a useful experience for me, have used @Steve-Mcl awesome node to measure a flow run time 
Actually, since this is likely all done in the node loop, the delays might not be a true reflection of time taken due to the potential blocking caused by the heavy encryption/decryption processing.
Create 2 separate flows and test again. (Operate them separately)
Results might show a different story.
fair point
So bottom line the delta of ~ 2 secs remains the same but percentage wise it doubles
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Good stuff. For a smallish image (5mb) this would equate to sub 1sec. So as long as the op is not wanting to do 25 frames per second, a fairly decent result.
btw @Steve-Mcl thanks for your timer sub flow. Have just learnt a whole heap about subflows and env variables.
This is very cool, especially in 1.3 when they can be exported to modules . Thanks
That can be coped with by the technique I mentioned earlier, which is to allow only particular MQTT users to access the sensitive topics.
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