Tab Drag and Drop between editors is CPU intensive

[youurayy]

• VSCode Version: 1.13.0
• OS Version: Windows 10

Steps to Reproduce:

1. open all 3 editor panes each with multiple files
2. drag tabs between these (the increased CPU usage happens after the drop)
3. observe CPU usage

This used to be fast (instant) in previous versions. Now it gives the feel of a heavy UI.

My custom settings:

{
    "window.zoomLevel": 0,
    "workbench.statusBar.visible": true,
    "editor.renderWhitespace": "all",
    "editor.wordWrap": "bounded",
    "editor.tabSize": 2,
    "editor.cursorBlinking": "solid",
    "git.confirmSync": false,
    "window.reopenFolders": "all",
    "window.restoreFullscreen": true,
    "workbench.editor.enablePreview": false,
    "workbench.editor.enablePreviewFromQuickOpen": false,
    "editor.lineNumbers": "off",
    "editor.detectIndentation": false,
    "editor.autoClosingBrackets": false,
    "editor.mouseWheelZoom": false,
    "editor.folding": false,
    "editor.rulers": [],
    "editor.glyphMargin": false,
    "editor.codeLens": false,
    "explorer.openEditors.visible": 999,
    "editor.fontSize": 14,
    "editor.scrollBeyondLastLine": false,
    "editor.quickSuggestions": false,
    "files.trimTrailingWhitespace": true,
    "terminal.integrated.shell.windows": "C:\\cygwin64\\bin\\bash.exe",
    "terminal.integrated.shellArgs.windows": ["/bin/xhere", "/bin/bash"],
    "window.newWindowDimensions": "maximized",
    "files.eol": "\n",
    "workbench.editor.revealIfOpen": false,
    "zenMode.hideTabs": false,
    "zenMode.restore": true,
    "git.enabled": false,
    "git.autorefresh": false,
    "git.autofetch": false,
    "git.countBadge": "tracked",
    "editor.formatOnType": false,
    "workbench.iconTheme": null,
    "editor.renderControlCharacters": true,
    "editor.renderLineHighlight": "all",
    "editor.minimap.enabled": false
}

[bpasero]

@youurayy can you record a screencast how you are doing that?

[youurayy]

@bpasero is there a suggested way to record a screencast on Windows 10?

I've tried to disable editor.renderIndentGuides and it feels a bit snappier although the CPU graphs don't support that. I'll see if I can come back with more info.

[bpasero]

@youurayy are you on a 4k monitor maybe?

[youurayy]

@bpasero yes!

[bpasero]

Closing, no plans currently to work on this near term.