Ive noticed this kind of slow loading with Customer Voice surveys a few times. It seems like its more about the browser or network stuff than the survey being broken itself. Like, maybe the session is acting up or something in the environment is lagging.
One thing to try first is opening it in private mode, you know, like Incognito in Chrome or InPrivate in Edge. That usually clears out any old cache thats hanging around.
Customer Voice uses those Microsoft 365 tokens for login, and if the cache is stale, it can make everything load super slow or even time out. I think that fixes it a lot.
Switching browsers might help too. Edge works pretty reliably with Power Platform things, from what Ive seen. And if youre on a VPN, just turn it off and try again. Sometimes that alone does the trick.
You could also use a different network, say switch to your phones hotspot. That way you can check if its firewall issues or just slow internet causing the delay.
Now, is this happening to everyone or just you? If its a bunch of people, then it might be something with the whole Power Platform setup or service being off. Kind of annoying when that happens.
Your admin should look at the Microsoft 365 Admin Center, under health and service health. See if there are any problems listed for Customer Voice, or Power Apps, or even Dataverse. That part gets a bit messy to track down sometimes.
Also, if the survey has all that branching logic or ties into Dataverse or Power Automate flows, those can slow it down because they have to wait on other services. I might be oversimplifying, but yeah, integrations add extra steps.
In most cases Ive heard about, the private mode or ditching the VPN sorts it right out. But if it keeps going even after trying different networks and users, probably need to get Microsoft support involved for the environment side. Hope that points you in the right direction.