Dear @Phu_Doan,
I can empathize with your concerns, having also experienced similar speed-related problems on Retool. For instance, you can observe this issue through my experiences detailed in the threads below:
Opening Retool public app start with GRAY background
Choose an outbound region for DATABASES
These threads, as well as yours, all focus on the speed-related aspects. It's becoming increasingly apparent that the loading speed of Retool's pages significantly affects its users' experiences. The initial gray or white screens during loading periods impact our workflow, which is something that needs to be addressed by Retool.
I firmly believe that as a community, raising our collective voice on this matter could effect essential changes. An upgrade in Retool's loading speed is not just a luxury, but a crucial necessity. We hope that Retool will take our feedback into account, as enhancing speed has now become a high priority on our lists.
Thank your for bringing up this problem, and let's continue this dialogue to get Retool's attention on this matter.
Patrick