Hi @Sen ,
The error you’re asking about occurs when too many requests are sent to Quick within a short timeframe, triggering our rate limiting protections.
As per this previous Quick discussion, we still recommend you to load no more than 3 embedded dashboards simultaneously.
As you mentioned trying to load ~50 dashboards simultaneously, in addition to the staggering approach, please consider if there’s the opportunity to consolidate the number of dashboards which can help to reduce the number of requests sent to Quick.
You can keep up to date on Quick announcements here on the Community page.
If you need more help on this please submit a support case through AWS Support for technical assistance.
I am marking this reply as the solution as it addresses all of your concerns.