When I activate a draw toolbar, there is a slight delay before any map click actually start to draw. (~ 1sec) This is a problem if you activate a tool in a application and want to start drawing quickly - especially if you know the application quite well and you are in a hurry.
This only happen in IE and Edge and don't appear in Chrome where the drawing ability is available immediately.
One thing that does make a difference (ability to draw is available quicker) is to remove the dijit theme CSS (i.e. : <link rel="stylesheet" href="//js.arcgis.com/3.12/dijit/themes/claro/claro.css">), as mentioned by 'macroexpand' here:
Unfortunately I cant remove the CSS. Any advice/options?