Bookmarks toolbar unresponsive after importing large number of bookmarks.

[binarysubstrate]

Did you search for similar issues before submitting this one?
Similar to #7240 (Closed, but not resolved in version 19.)
#4044 (Open, little info provided.)
#5404 (Open, but specific to favicons.)

Describe the issue you encountered:
The bookmarks toolbar unresponsive after importing large number of bookmarks. (~1200)

• Clicking the "Imported" folder causes the browser to become unresponsive.
• And simply dragging a new bookmark to the toolbar also causes this.

Platform (Win7, 8, 10? macOS? Linux distro?):
Windows 10 x64

Brave Version (revision SHA):
Brave 0.19.139
rev 99aa17d

Steps to reproduce:

• Import data from Firefox 57.0.4 (64-bit) including about 1000 bookmarks.
• Enable the bookmarks toolbar.
• Click the "imported" folder. Or try to create a new bookmark on the toolbar.

Actual result:
Browser becomes unresponsive for 10-20 seconds.

Expected result:
Imported bookmarks should not impact browser performance.

Is this an issue in the currently released version?
Yes

Can this issue be consistently reproduced?
Yes

Other browser info:
Brave 0.19.139
rev 99aa17d
Muon 4.7.2
libchromiumcontent 64.0.3282.85
V8 6.4.388.20
Node.js 7.9.0
Update Channel Release
OS Platform Microsoft Windows
OS Release 10.0.16299
OS Architecture x64

[luixxiul]

Hi, that performance issue should be fixed on 0.20.x releases. thanks!

[bsclifton]

Closing since 0.20.x has been released. Please re-open if you still find the performance to be bad 😄