I've actually found the search in the web interface to be very fast and pretty good in terms of finding what I'm looking for with >70k messages.
When I switched from Gmail a few years ago (https://masnick.org/2013/07/19/fastmail/), one of the most striking changes was how fast FastMail's interface was compared to Gmail. FastMail did a huge update to their search code just as I switched, and I haven't looked back.
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I've actually found the search in the web interface to be very fast and pretty good in terms of finding what I'm looking for with >70k messages.
When I switched from Gmail a few years ago (https://masnick.org/2013/07/19/fastmail/), one of the most striking changes was how fast FastMail's interface was compared to Gmail. FastMail did a huge update to their search code just as I switched, and I haven't looked back.