When I launch the application, a modest document of 1,500 lines can be scrolled smoothly.
After around 10 minutes of usage, however, I notice that the document is scrolling in a very jerky way, with visible lag.
Opening up the Activity Monitor, I see PhpStorm idling at 0.5% CPU. If I then scroll the page, I see it jump to 100% CPU usage.
Clearly something has happened since the previous release and this one, performance is visibly worse.