Large Bookmarks.plist file makes Safari v. laggy

Discussion in 'OS X Yosemite (10.10)' started by theorist9, Jun 18, 2015.

  1. theorist9, Jun 18, 2015
    Last edited: Jun 20, 2015

    theorist9 macrumors member

    May 28, 2015
    When I use a "clean" Bookmarks.plist file, Safari is very responsive -- new windows open in ~<=0.3 sec., and the window resizes smoothly and rapidly when I drag it with the cursor. But with my regular 640 KB Bookmarks.plist file (2800 items), the program becomes very laggy -- it takes a second or two to open a new window (even if I have it set to open an "empty window"), and there's stuttering when I resize the window.

    I've cleared out all my Safari history and caches (basically everything except my passwords and bookmarks), did an SMC and PRAM reset, and reinstalled Yosemite, yet Safari is still very laggy for me -- the only thing that fixes this is switching from my original Bookmarks.plist file to a clean one; so I'm reasonably sure that's the culprit.

    Any idea of why this is happening, or what I might do to fix it? I did a screenshare with a senior Apple advisor, and he could see that the difference with-vs.-without the file was striking, and said he had never heard of this. He promised to consult with the engineers, but in the meantime I thought I'd see if the collective expertise here might be able to help.

    System info.: Yosemite 10.10.3, Safari 8.0.5
    MBP 11,3 (15" Retina, Feb 2015), 2.8/4.0 GHz Core i7-4980HQ, 1TB SSD/4-lane PCIe, 16GB RAM
  2. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    Just an idea, but worth a try.

    Go to the Safari File menu and toward the bottom select Export Bookmarks... and save that to the desktop. Then quit Safari and delete the bookmarks.plist file and launch Safari. This should give you a blank plist with default bookmarks. Now go back to the Safari file menu and import the bookmarks from the HTML backup we made earlier.

    That will hopefully get you a clean plist with your bookmarks in there.
  3. theorist9 thread starter macrumors member

    May 28, 2015
    Thanks, your suggestion was quite helpful in enabling me to figure out the problem. I tried what you suggested and it was much faster, but only because the favorites were imported into a subfolder and thus not displayed in the favorites bar. Once I imported them into the main list of favorites, the behavior returned. This was very helpful, because it enabled me to pinpoint the issue:

    It's not the presence of the large Bookmarks.plist file itself. Instead, it's about 75% from displaying the Favorites Bar and 25% from having new windows open with the Favorites. Even while keeping the large Bookmarks.plist file, here's what I find for responsiveness:

    Favorites Bar + new Window opens with favorites: really slow
    Favorites Bar + new Window is empty: still pretty slow
    No Favorites Bar + new Window opens with favorites: fairly fast
    No Favorites Bar + new Window is empty: really fast
  4. theorist9 thread starter macrumors member

    May 28, 2015
    I just tested this with Firefox and Chrome, using the same set of bookmarks. Both show the same qualitative behavior as Safari in the presence of the favorites bar. HOWEVER, while Firefox slows down about as much as Safari, Chrome is only slightly slowed.

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