In the JS console I can see 51 POST requests having been made to https://api.github.com/graphql. Of those, most are the result of a paginated query called GetMentionableUsers that preloads all mentionable users for this repository.

A giant repository like rails/rails will have 4304 mentionable users, which includes all org members and all prior contributors to the codebase. It will take at least 44 sequential API requests to paginate them all. It's not clear to me why a fresh VS Code instance would preload all this before this information is needed for anything. Could this load to the GitHub API be avoided?