Chrome performance optimizations on Windows

Google announced today that the company's Chrome 53 web browser is up to 15% faster on Windows thanks to a technique called Profile Guided Optimizations.

The improvement comes from making use of Microsoft's Profile Guided Optimization (PGO) technology that Google implemented in Chrome 53 and 54.

Profile Guided Optimization uses results of profiling test runs of a program to optimize source code before final compilation and distribution.

Chrome is not the first web browser to support Profile Guided Optimization. An entry on the Mozilla Developer Network indicates that Firefox has been supporting PGO for builds since 2013.

Chrome performance optimizations on Windows

chrome performance windows

Google's use of Profile Guided Optimization on Windows builds of Chrome has the following effect on the browser:

  1. Startup time of Google Chrome: 16.8% faster.
  2. Page load time: 5.9% faster.
  3. New tab page load time: 14.8% faster.

Google explains how PGO helped its developers create a faster browser on Windows:

Chrome is a huge software project with more than a million functions in its source code. Not all functions are equal - some are called frequently, while others are rarely used. PGO uses data from runtime execution that track which functions are most common to guide optimization.

To gather this data, the nightly build process now produces a special version of Chrome that tracks how often functions are used. PGO then optimizes those high-use functions for speed, in some cases increasing the binary size of those functions. To balance out that increase, PGO also optimizes less-used functions with smaller, though slightly slower code. These trade-offs result in higher overall performance, and a smaller overall code footprint.

PGO also optimizes the memory location of the code, moving rarely-used functions away from frequently-used ones in memory.  This results in more optimal use of the CPU instruction cache by avoiding caching of less-used code, increasing overall performance. There are many other tricks that PGO uses to make Chrome faster, and they add up to great results.

To explain it in simple terms: PGO analyzes how a test version of Chrome performs and tracks various functions to find out which functions are of high importance and which are not. It then provides those information to the actual build process of the Chrome browser that uses the information to optimize it.

The 64-bit version of Google Chrome for Windows utilizes PGO since version 53, the 32-bit version of Chrome for Windows since version 54.

While the improvement is significant from a statistical point of view, it is unclear if users will notice the improvements  unless Chrome's startup, page load time or new tab page load time was significantly slower than the average to begin with.

Now You: Did you notice performance improvements when running Chrome?

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Chrome performance optimizations on Windows
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Google announced today that the company's Chrome 53 web browser is up to 15% faster on Windows thanks to a technique called Profile Guided Optimizations.
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Ghacks Technology News
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Responses to Chrome performance optimizations on Windows

  1. seeprime November 1, 2016 at 12:33 am #

    What I noticed with 32-bit Chrome 54 is printed text is now often scrambled. It was already fast.

  2. chesscanoe November 1, 2016 at 2:45 am #

    I switched from Chrome 54 x64 to Opera 41 x32 as my default browser, and for what I do, Opera seems faster in general. I have no formal benchmarks to prove this. But Opera remembers the last open tab prior to the active tab,and always makes it active when you close the current active tab. When you add to the bookmark bar, in Opera it's placed on the left, where I in fact want it. Opera's Speed Dial apparently holds as much as you care to define, and their order can be dragged to your preference. All the Chrome extensions I want work in Opera, and in one case work better than in Chrome. I look forward to Opera 42 x64 if and when it is released. I just hope is reasonably secure. I don't recall Opera offering a bounty to fix security flaws.

  3. beergas November 1, 2016 at 6:20 pm #

    I do use Chrome but noticing lately a few sites (financial usually) are starting to refuse it stating to use another browser, often suggesting IE 11 or Edge. Even tried to access Outlook.com other day and it refused to log me in. Had to use Edge. Maybe once logged in but nope still barfs. Oh well no matter but bit of arsepain.
    We can't get that information right now. Please try again later.

  4. Jeff November 1, 2016 at 7:37 pm #

    Note that PGO is a compiler feature and available in Visual Studio 2005 and later/Visual C++ 2005 and later.

  5. Dheeraj Chandel November 3, 2016 at 9:05 am #

    Hi All

    Please help me as i want to enable disappear download bar in chrome browser when download files from internet
    confirm perfect setting for same

  6. Kubrick January 28, 2017 at 10:29 pm #

    what about linux chrome.?

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