Unusual memory usage spike (~ 500 MiB) during login?

[MasterInQuestion]

    Both:
    https://account.proton.me/mail
    https://account.proton.me/login
    (the 2nd is mere login, not even loading Mail)

    Extraordinary amount of memory seems requested:
    And soon released. (only for few seconds)
    (is it really used..?)

    The behavior is unusual comparing to other crypto-mail, e.g. Tuta.
    Where the login flow won't cause alike.

    Probably relevant:
    https://github.com/ProtonMail/WebClients/issues/38#issuecomment-303186785

[MasterInQuestion]

    Password change within the Settings interface would also cause alike.
    Probably some suboptimal memory management was used for the key handling.