{"action":"closed","issue":{"url":"https://api.github.com/repos/atom/electron/issues/4001","labels_url":"https://api.github.com/repos/atom/electron/issues/4001/labels{/name}","comments_url":"https://api.github.com/repos/atom/electron/issues/4001/comments","events_url":"https://api.github.com/repos/atom/electron/issues/4001/events","html_url":"https://github.com/atom/electron/issues/4001","id":125106804,"number":4001,"title":"Accessibility code causing input lag","user":{"login":"paulcbetts","id":1396,"avatar_url":"https://avatars.githubusercontent.com/u/1396?v=3","gravatar_id":"","url":"https://api.github.com/users/paulcbetts","html_url":"https://github.com/paulcbetts","followers_url":"https://api.github.com/users/paulcbetts/followers","following_url":"https://api.github.com/users/paulcbetts/following{/other_user}","gists_url":"https://api.github.com/users/paulcbetts/gists{/gist_id}","starred_url":"https://api.github.com/users/paulcbetts/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/paulcbetts/subscriptions","organizations_url":"https://api.github.com/users/paulcbetts/orgs","repos_url":"https://api.github.com/users/paulcbetts/repos","events_url":"https://api.github.com/users/paulcbetts/events{/privacy}","received_events_url":"https://api.github.com/users/paulcbetts/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/atom/electron/labels/bug","name":"bug","color":"fc2929"},{"url":"https://api.github.com/repos/atom/electron/labels/windows","name":"windows","color":"c7def8"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":7,"created_at":"2016-01-06T04:16:31Z","updated_at":"2016-01-08T01:56:00Z","closed_at":"2016-01-08T01:56:00Z","body":"It appears that #3336 or #3323 (not sure which yet) are causing serious input lag / typing performance regressions on Windows on certain machines. Timeline traces will show a significant amount of JS CPU time spent in \"Other\" while typing. You can also see these messages spammed constantly in console\r\n\r\n```\r\n[2476:0105/200323:WARNING:browser_accessibility_manager_win.cc(96)] Not firing AX event because of no hwnd\r\n[2476:0105/200323:WARNING:browser_accessibility_manager_win.cc(178)] Not firing AX event because of no root_delegate or hwnd\r\n[2476:0105/200323:WARNING:browser_accessibility_manager_win.cc(96)] Not firing AX event because of no hwnd\r\n[2476:0105/200323:WARNING:browser_accessibility_manager_win.cc(178)] Not firing AX event because of no root_delegate or hwnd\r\n[2476:0105/200323:WARNING:browser_accessibility_manager_win.cc(96)] Not firing AX event because of no hwnd\r\n[2476:0105/200323:WARNING:browser_accessibility_manager_win.cc(178)] Not firing AX event because of no root_delegate or hwnd\r\n[2476:0105/200323:WARNING:browser_accessibility_manager_win.cc(96)] Not firing AX event because of no hwnd\r\n```\r\n\r\nI'm going to look into this bug more and see if we can fix up the typing lag while still leaving a11y enabled\r\n"}}