Hello Matt,
I clearly mentioned the steps I followed to get 24 MB. I have been able to recreate it multiple times and have shot a video which I will send in the same ticket.
Open login page, enter login details and wait for first mail to show up. This needs 55 seconds to load and takes 23-24MB (for some reason login page js was cached in this video.)
2 json files of mail and /api/v1/contacts/address-book/mail , each of exactly 9.78MB are downloaded. Total of these 2 files itself is 19.56MB.
Why does loading the first mail or first few emails need 20MB data downloaded ?
We are based in India, here some users are still on kbps based broadband, not even 1 mbps. SmarterMail v15 was running perfectly on these connections.