URL bar input lag with 1000+ bookmarks

[ayumi]

• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  When the browser has many bookmarks, the URL bar lags between typing and displaying input.

• Platform (Win7, 8, 10? macOS? Linux distro?):
  MacOS

• Brave Version (revision SHA):
  master @ db26cac

• Steps to reproduce:
  0. Instrument onKeyUp() in app/renderer/components/navigation/urlBar.js by adding console.log(${new Date().getTime()} onKeyUp >) at the beginning and console.log(${new Date().getTime()} onKeyUp <) at the end of the function.

  1. Open Brave and import 1000+ bookmarks.
  2. Toggle browser debug console and open the JS console.
  3. Focus the URL bar and press the "A" key repeatedly.
  4. Observe browser debug JS console for onKeyUp() latency.

• Actual result:
  Latency is ~200ms.

• Expected result:
  <10ms (On a fresh profile, it takes ~3ms).

• Will the steps above reproduce in a fresh profile? If not what other info can be added?
  Requires 1000+ bookmarks.

• Is this an issue in the currently released version?
  Yes

• Can this issue be consistently reproduced?
  Yes

[cndouglas]

Related to/duplicate of #7453 (Performance : urlbar response is slow when searching across many bookmarks).

[ayumi]

@liunkae thanks! closing in favor of that