There is a certain point where UX responsiveness has a huge impact on how the product gets used.

I hate Jira with a burning passion simply because it is slow where I live (in China, with a VPN). Even minor interactions, like clicking on a task’s description to edit it, takes about 2 seconds. Opening a task from a list takes around 5 seconds.

The result is that I and my coworkers avoid using Jira unless we really have to. Ad-hoc work that wasn’t planned as part of the sprint just doesn’t get tracked because doing so is unreasonably painful.