doc: improved detection via FileSystemObserver

Author: tophf

content/posts/how-to-edit-scripts-with-your-favorite-editor/index.md

@@ -44,6 +44,8 @@ You can use any of these methods listed in the order of increasing complexity:
 
 ⚠ Only implemented in Chrome/Chromium 86 or newer and Violentmonkey 2.16 or newer.
 
+⚡ In up-to-date Chrome you can improve performance of detection using the cutting edge FileSystemObserver API: navigate to `chrome://flags/#enable-experimental-web-platform-features` and enable the flag, then restart the browser. This is a one-time setup until the API becomes stable.
+
 ⚡ If you assigned a hotkey to activate Violentmonkey in the browser's options for extensions, you can press it while dragging the file, which opens the extension's popup into which you can drop the dragged file.
 
 #### 2.2. Drag the file into the browser toolbar or tab label area