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Unbearably slow focus (2s) #16
When I open a file or switch buffers there is a delay of about 2 to 4 seconds while the editor appears to be hung and my new file is not displayed. When I close the editor, a similar delay seems occur for each file as it works to close them.
Most of the time is taken up in setState in extended-tree-view.js. This occurs even when no other non-core packages are installed.