I'd like to suggest to use noatime mount option for btrfs.
I've come across two posts about combining atime with btrfs. Unfortunately those two should not be combined, as explained here: https://lwn.net/Articles/499293/; and here: Why I experience poor performance during file access on filesystem?
TL;DR: btrfs and atime should not be combined because it causes more problems than it fixes due to the nature of CoW. CoW already does what atime should do, so we are essentially losing a lot more performance than we should, just because we have atime. Another thing, reading files after a snapshot can cause files to grow considerably.
I would suggest to use noatime mount option by default for increased performance and to prevent high space consumption.
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