On the other other hand, my WhatsApp is currently using 87.6MB (WhatsApp) + 115.3MB (WhatsApp Helper) + 99.8MB (WhatsApp Helper) for a total of 302.7MB.

(Creative Cloud is using 234.9MB and that's nothing more than a damn launcher!)

I just downloaded the latest WhatsApp update, ( I think it was released a few days ago ).

Now it is 164MB + 104MB + 85MB! And these measurement were not under high memory pressure! This isn't small by any means, still a total of ~350MB for a simple tool, but it is similar to Telegram which is a native Mac App. The two WhatsApp helper were previously using 700MB each!

And the major major improvement is compressed memory. Previously it didn't compress much at all. It was the same 700MB. Now it is 4.6MB + 5.2MB + 8.5MB, that is total of 18.3MB!!!!

I have no idea what happened, but in terms of compressed memory that is nearly 99% reduction in memory!

( Actually I am really interested in what happened, I wish they have changelog or blog post on the fix )

5 Hours later, 250MB + 250MB + 90MB. That is 590MB, so may be it wasn't as good as I thought.

And 24 hours later, All WhatsApp Added up to 1.2GB. So your figures were completely wrong.

No, my figures are still correct. That was the state of my system at the time.

Right now (20181223T1031Z) WhatsApp (87.5MB) + WhatsApp Helper (149.9MB) + WhatsApp Helper (171.7MB) are using a total of 408.5MB.

Everyone's system is different. Everyone's WhatsApp is different. Everyone's memory usage will be different.