My stack have 800+ resources, most of them are static assets of pulumi/azure-static-website. Why ‘pulumi up’ took 4+ mins for 803 unchanged resources? I just add one more output for cdnURL. Did pulumi verify each resource for change one by one?

It somewhat depends on how you ran

pulumi

— for example if you passed the

--refresh

option, then yes, that would happen. You might want to have a look at the SyncedFolder component, which lets you upload the contents of a folder without having Pulumi manage each file individually: https://www.pulumi.com/registry/packages/synced-folder/