Yeah their startup times aren’t great. They’re making a trade off by loading a ton of data up front, though to be fair a lot of the local first web tooling didn’t really exist when they were founded - the nascent Zero Sync framework’s example project is literally a Linear clone that they use as their actual bug tracker, it loads way faster and has similarly snappy performance, so seems clear that it can be done better.

That said at this point Linear has more strengths than just interaction speed, mainly around well thought out integrations.