I am definitely going to subscribe to this thread not because I understand Looker Studio but because the Looker Studio help community seems very unmonitored (maybe I can get a hint here on who is supposed to be looking over it even)...but you are not the only person to report issues with Looker Studio as well: https://support.google.com/looker-studio/thread/233379583/report-stuck-at-loading.
FWIW, there is several issues with Looker Studio today including dashboards not loading (https://support.google.com/looker-studio/thread/233379755), changing field formats (https://support.google.com/looker-studio/thread/233369036), and etc.
FWIW performance seems to be better than earlier today but still not 100%. It'd be nice if someone from Google could provide an update here and/or in Looker Community (especially since the Google Status Dashboard doesn't provide any insight into Looker).
The Googler in the Looker Community is Rick E (https://support.google.com/profile/8637) but I was literally just thinking for the past week that he may need some help over there since he is not too active there (posts maybe up to 10 times per month even though the community gets 500 posts and up to 700 comments it looks like to me).
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