WebStorm 2018.3.4 is now available! Learn more about fixes and improvements in the blog post: https://blog.jetbrains.com/webstorm/2019/01/webstorm-2018-3-4/ …
Sorry to hear that. We would really appreciate it if you can provide some additional diagnostic data to help us investigate the problem. A CPU snapshot captures during the slow-down would be very helpful:https://intellij-support.jetbrains.com/hc/en-us/articles/207241235-Reporting-performance-problems …