> Why would you expect anything different when JS _does_ run in a single thread? No reason for site A rendering to block site B; no reason for either to block

> Why would you expect anything different when JS _does_ run in a single thread? No reason for site A rendering to block site B; no reason for either to block the main UI. No reason for an issue tracker to take 10 seconds to achieve interactivity on LAN (heck, I'd consider 0.5 seconds slow).