Dev tools very slow to open (Beta / Nightly)

[bsclifton]

Description

Trying to open the dev tools on Nightly takes a really long time to open on Windows

For example, if you push F12 to open for a page, it takes 28 seconds for this to show on my machine. Loading the contents of the dev tools takes another 5 seconds to load ☹️

Steps to Reproduce

1. Be on Nightly on Windows
2. Visit a website
3. Press F12 or right click => Inspect

Actual result:

It appears like nothing happens; but if you wait long enough, EVENTUALLY it'll open the tools

Expected result:

Dev tools should open immediately

Reproduces how often:

All the time

Brave version (brave://version info)

Brave	1.24.8 Chromium: 89.0.4389.90 (Official Build) nightly (64-bit)
Revision	62eb262cdaae9ef819aadd778193781455ec7a49-refs/branch-heads/4389@{#1534}
OS	Windows 10 OS Version 2009 (Build 19042.867)

Version/Channel Information:

Nightly

• Can you reproduce this issue with the current release? N
• Can you reproduce this issue with the beta channel? N
• Can you reproduce this issue with the nightly channel? Y

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? N
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome? N

[qngapparat]

Also happens on Mac: #14721

[technocapeman]

As per my experience, this also happens regularly on the current release v1.22.66 as well.

[bsclifton]

Closing as duplicate of #14721

[bsclifton]

Re-opening to track this problem on Beta / Nightly

[LaurenWags]

Verified passed with

Brave	1.22.70 Chromium: 89.0.4389.105 (Official Build) (arm64)
Revision	14f44e21a9d539cd49c72468a29bfca4fa43f710-refs/branch-heads/4389_90@{#7}
OS	macOS Version 11.2.3 (Build 20D91)

Verified STR from description.
Verified test plan from brave/brave-core#8336 (comment).

Opened dev tools from multiple places:

• keyboard shortcut (cmd+opt+i)
• right click > Inspect
• hamburger menu (More Tools > Developer Tools)
• macOS menu bar (View > Developer > Developer Tools)

Dev tools opened instantly in each of the above cases.

---

Verification passed on

Brave | 1.22.70 Chromium: 89.0.4389.105 (Official Build) (64-bit)
-- | --
Revision | 14f44e21a9d539cd49c72468a29bfca4fa43f710-refs/branch-heads/4389_90@{#7}
OS | Windows 10 OS Version 2004 (Build 19041.867)

Verified STR from description.
Verified test plan from brave/brave-core#8336 (comment).

Opened dev tools from multiple places:

• keyboard shortcut F12
• right-click > Inspect
• hamburger menu (More Tools > Developer Tools)

Dev tools opened instantly in each of the above cases and able to inspect the elements.

---

Verification passed on

Brave	1.22.70 Chromium: 89.0.4389.105 (Official Build) (64-bit)
Revision	14f44e21a9d539cd49c72468a29bfca4fa43f710-refs/branch-heads/4389_90@{#7}
OS	Ubuntu 18.04 LTS

Verified STR from description.
Verified test plan from brave/brave-core#8336 (comment).

Opened dev tools from multiple places:

• keyboard shortcut F12
• right-click > Inspect
• hamburger menu (More Tools > Developer Tools)

Dev tools opened instantly in each of the above cases and able to inspect the elements.

---

Verification PASSED on macOS 11.2.3 x64 using the following build:

Brave | 1.22.70 Chromium: 89.0.4389.105 (Official Build) (x86_64)
--- | ---
Revision | 14f44e21a9d539cd49c72468a29bfca4fa43f710-refs/branch-heads/4389_90@{#7}
OS | macOS Version 11.2.3 (Build 20D91)

Verified STR from description.
Verified test plan from brave/brave-core#8336 (comment).

Opened dev tools from multiple places:

• keyboard shortcut (cmd+opt+i)
• right click > Inspect
• hamburger menu (More Tools > Developer Tools)
• macOS menu bar (View > Developer > Developer Tools)

Dev tools opened instantly in each of the above cases.