Pages are rendering too slowly

[alexwykoff]

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

Describe the issue you encountered:
When opening a new tab it takes a ... really... long... time...
It was also noticed that common pages were also rendering slowly on first visit.

Expected behavior:
It should be considerably faster.

• Platform (Win7, 8, 10? macOS? Linux distro?):
  Tested on OS X

• Brave Version:
  0.12.9 RC1

• Steps to reproduce:

  1. Open a new tab
  2. Open a new tab
  3. Open a new tab

• Screenshot if needed:
  

• Any related issues:

[bbondy]

Could you double verify on 0.12.8 and 0.12.9 to make sure this is new? I want to make sure it's not from something like a background process running. In particular I mean for pages that are not the new tab page.

[bsclifton]

I'm not sure what kind of action to take here- I guess we can wait until the new built happens before revisiting? Setting the cache-control headers might help, since now it shouldn't even make an external request for the images (well, once they're cached)

[bbondy]

there seems to be something weighing down the browser in general, I'm not sure what but I think we have to bisect to figure it out. Profiling cpu showed time in ipc sync send which is normal.

[bbondy]

This seems faster with master so I'm going to close and please re-open if it's slow in the next build.

[bbondy]

nevermind I just experienced the slowness again.

[bbondy]

I had to bisect this, but found it and reverted here:
037f7c0

[bbondy]

Re-opened this issue
#4274
which caused the problem after the revert, so closing this now:

[srirambv]

Looks good on Windows

[srirambv]

Looks a little slow on Ubuntu. Could be because of VM.