[krautsourced]

In the case of Jira, how much of that is related to frontend code, compared to backend code / inefficient queries?

I find performance suffers mostly when media assets, advertisments, marketing and tracking scripts etc. come into play. The frontend rendering rarely makes a dent at that point.

[DoesntMatter22]

The FE is like 5% of the slowness if that. You have a 2 second query and then 50-100ms to render.