Description
Package Manager 'My Assets' window takes a lot of time (1m07s in this instance) to show up the 'Update' button allowing user to update its package version.

Repro Steps
Internally, we have not reproduced it yet but from user's video:
1. Make sure you own asset store packages with updates available
2. Open Package Manager > My Assets
3. Sort by latest update
4. Wait for the 'Update' button to become visible in package details action bar

Expected Result
- It should take a reasonable amount of time
- Improvement: maybe add a spinner to show user Unity is requesting updates from asset store API

Actual Result
In this instance, 1m07s later, the 'Update' button shows up.