I know Fidelity changed their default dashboards to not load data-heavy views for the past week or two. Usually you get a nice dashboard page with some charts and personalized info, but right now you get a few generic (non-customized) market stats and a bunch of generic links.

Still useful enough, and if you want, you can get to your own dashboard... but things like this (inconsequential as they seem) can be the difference between going down or not.

Each non-personalized element on the page that's removed saves at least one DB query (and in a fancy app like Robinhood's case, maybe a half dozen).

Well, market circuit-breakers are being triggered all over the world. I doubt anyone would be able to trade even if they could log in.