The comparison to Jira is unfair, Jira is known for abysmal performance.
Linear was really, incredibly fast. We adopted it in 2021 and it was amazing.
Now it’s bloated. That’s the standard path for most software (Zawinski’s Law), and I’m not very excited when they ship another feature. Most of the new stuff isn’t for small players, they’re more of an alternative for medium and large businesses.
I think it depends on your job/role. Unless you're spending literally all day in Jira, I don't think the performance (or even more broadly, the enjoyment) of one's task tracker affects productivity that much.