Choose a version:
29% The original file has 1852517 bytes (1,809.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 528047 bytes (515.7k, 29%).

After GZIP compression these minified files vary in size:
Boot
  162823 bytes (159.0k)
CDN
cdnjs
  132960 bytes (129.8k)
CDN
gzip -6 (default)
  131144 bytes (128.1k)
local copy
gzip -9
  130664 bytes (127.6k)
local copy
7zip -mx=9 -tgzip
  126102 bytes (123.1k)
local copy
libdeflate -12
  125962 bytes (123.0k)
local copy
pigz -11 -n
  125882 bytes (122.9k)
local copy
kzip -s0 -rn -b5
  125649 bytes (122.7k)
local copy
Zopfli
  125601 bytes (122.7k)
local copy
Zopfli (defluff)
  125597 bytes (122.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.11.3.min.js

You will automatically get the smallest Ember 2.11.3 file, ETag caching is available and
if your browser doesn't support GZIP decompression then the uncompressed version will be sent.

Currently best Zopfli settings

Save 7359 bytes by using my Ember 2.11.3 Zopfli version instead of the best available CDN (5.86% smaller than cdnjs, 125601 vs. 132960 bytes):
You can use my super-compressed files for whatever purpose you like as long as you respect the library's original license agreement.
There are no restrictions from my side - but please avoid hot-linking if you run a high-traffic website.

These command-line settings yielded the best compression ratio so far (Linux version of zopfli-krzymod):
zopfli --i1000000 --mb8 --mls16384 --bsr15 --lazy --ohh

(found March 25, 2017)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 16384  --mls16384
block splitting recursion 15  --bsr15
lazy matching in LZ77 yes  --lazy
optimized Huffman headers yes  --ohh
initial random W for iterations 1  --rw1
initial random Z for iterations 2  --rz2

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 4 more bytes (125597 bytes).

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.11.3/ember.min.js --location | md5sum
77061b5dba4532f08d2913ce4634115b  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.11.3.min.zopfli.js.gz | md5sum
77061b5dba4532f08d2913ce4634115b  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.11.3/ember.min.js --location | sha1sum
6d8516cd191bf8333b32dcc2f41272e08e269ecc  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.11.3.min.zopfli.js.gz | sha1sum
6d8516cd191bf8333b32dcc2f41272e08e269ecc  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 162823 bytes 77061b5dba4532f08d2913ce4634115b March 12, 2017 @ 22:40
cdnjs 132960 bytes 77061b5dba4532f08d2913ce4634115b March 9, 2017 @ 05:33

Note: only the MD5 hashes are shown to keep things simple.

Other Versions

Available Ember versions at minime.stephan-brumme.com:

3.0.0,
2.18.2, 2.18.1, 2.18.0,
2.17.2, 2.17.1, 2.17.0,
2.16.2, 2.16.1, 2.16.0,
2.15.3, 2.15.2, 2.15.1, 2.15.0,
2.14.1, 2.14.0,
2.13.4, 2.13.3, 2.13.2, 2.13.1, 2.13.0,
2.12.2, 2.12.1, 2.12.0,
2.11.3, 2.11.2, 2.11.1, 2.11.0,
2.10.2, 2.10.1, 2.10.0,
2.9.1, 2.9.0,
2.8.3, 2.8.2, 2.8.1, 2.8.0,
2.7.3, 2.7.2, 2.7.1, 2.7.0,
2.6.2, 2.6.1, 2.6.0,
2.5.1, 2.5.0,
2.4.6, 2.4.5, 2.4.4, 2.4.3, 2.4.2, 2.4.1, 2.4.0,
2.3.1, 2.3.0,
2.2.2, 2.2.1, 2.2.0,
2.1.2, 2.1.1, 2.1.0,
2.0.3, 2.0.2, 2.0.1, 2.0.0,
1.13.13, 1.13.12, 1.13.11, 1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.2, 1.12.1, 1.12.0,
1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.1, 1.10.0,
1.9.1, 1.9.0,
1.8.1, 1.8.0,
1.7.1, 1.7.0,
1.6.1, 1.6.0,
1.5.1, 1.5.0,
1.4.0,
1.3.2, 1.3.1, 1.3.0,
1.2.2, 1.2.1, 1.2.0,
1.0.1, 1.0.0

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Dojo, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
125601 bytes -2 bytes zopfli --i1000000 --mls16384 --bsr15 --lazy --ohh March 25, 2017 @ 14:55
125603 bytes -3 bytes zopfli --i100000 --mls16384 --bsr15 --lazy --ohh March 23, 2017 @ 14:03
125606 bytes -3 bytes zopfli --i100000 --mls16384 --bsr23 --lazy --ohh March 23, 2017 @ 10:55
125609 bytes -9 bytes zopfli --i10000 --mls16384 --bsr23 --lazy --ohh March 12, 2017 @ 01:37
125618 bytes -27 bytes zopfli --i1000 --mls16384 --bsr8 --lazy --ohh March 11, 2017 @ 14:06
125645 bytes zopfli --i100 --mls16384 --bsr23 --lazy --ohh March 11, 2017 @ 04:41

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on March 26, 2017 @ 07:54.

Heatmaps

This Zopfli heatmap visualizes how compression changes when modifying the --bsr and --mls parameter.
Cell's contents is the best filesize achieved (in bytes, hover with mouse over cells to see number of iterations).

Good parameters are green, bad are red. The best and worst are bold as well.
The brightness of the blue background color indicates how many iterations were processed:
10,000, 100,000 or 1,000,000.
bsr \ mls
2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
bsr \ mls
2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
125757 125756 125756 125756 125757 125756 125756 125666 125667 125671 125748 125756 125757 125701 125757
125679 125681 125632 125756 125757 125685 125680 125681 125683 125633 125637 125756 125757 125611 125757
125692 125692 125694 125689 125690 125689 125690 125690 125688 125650 125699 125642 125676 125616 125681
125639 125637 125688 125695 125690 125687 125666 125688 125668 125641 125655 125756 125757 125618 125694
125692 125692 125691 125690 125688 125691 125689 125688 125665 125659 125659 125756 125757 125611 125681
125693 125693 125688 125697 125690 125688 125688 125688 125688 125637 125650 125628 125682 125691 125682
125690 125691 125690 125690 125690 125688 125688 125692 125688 125646 125628 125627 125675 125633 125686
125688 125688 125688 125688 125689 125688 125689 125689 125688 125653 125661 125631 125674 125615 125681
125689 125689 125688 125689 125690 125690 125688 125689 125690 125655 125640 125633 125687 125627 125684
125689 125689 125688 125695 125689 125688 125688 125688 125688 125675 125705 125669 125682 125638 125682
125667 125687 125689 125689 125687 125689 125684 125692 125688 125673 125650 125675 125674 125625 125682
125666 125687 125688 125695 125690 125687 125688 125692 125688 125647 125673 125627 125687 125601 125694
125688 125688 125688 125693 125690 125689 125688 125688 125688 125645 125641 125673 125687 125619 125682
125689 125689 125688 125695 125691 125688 125688 125688 125688 125653 125655 125629 125687 125627 125694
125689 125689 125688 125688 125691 125688 125692 125688 125688 125637 125636 125697 125675 125624 125682
125689 125689 125690 125688 125691 125681 125679 125692 125688 125631 125659 125669 125687 125626 125686
125689 125689 125688 125692 125689 125691 125688 125727 125691 125638 125658 125635 125672 125633 125690
125689 125689 125688 125688 125692 125688 125688 125692 125688 125635 125639 125627 125674 125621 125682
125689 125689 125688 125695 125691 125690 125689 125688 125688 125639 125638 125632 125673 125687 125686
125689 125689 125688 125695 125690 125690 125688 125692 125690 125650 125665 125634 125689 125606 125686
125689 125689 125688 125695 125690 125681 125688 125688 125688 125651 125638 125629 125682 125634 125686
125689 125689 125688 125688 125690 125688 125688 125688 125688 125660 125657 125669 125682 125634 125681
125692 125698 125688 125688 125689 125688 125688 125688 125688 125651 125639 125627 125687 125633 125682

Due to the Monte Carlo design of my search algorithm, not all parameters have reached the same number of iterations yet:
Iterations Min. Bytes Reduction Coverage
100 125645 bytes 100%
1,000 125618 bytes -27 bytes 100%
10,000 125609 bytes -9 bytes 100%
100,000 125603 bytes -6 bytes 0.58%
1,000,000 125601 bytes -2 bytes 0.29%
10,000,000

KZIP has far less options available for tuning/optimization. I only played around with the number of blocks (parameter -n):
Blocks Min. Bytes Compared To Best Zopfli Compared To Best KZIP
125715 bytes +114 bytes (+0.09%) +66 bytes
125724 bytes +123 bytes (+0.10%) +75 bytes
125769 bytes +168 bytes (+0.13%) +120 bytes
125766 bytes +165 bytes (+0.13%) +117 bytes
125711 bytes +110 bytes (+0.09%) +62 bytes
125649 bytes +48 bytes (+0.04%)
125705 bytes +104 bytes (+0.08%) +56 bytes
125723 bytes +122 bytes (+0.10%) +74 bytes
125774 bytes +173 bytes (+0.14%) +125 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 85124 bytes -40477 bytes (-32.23%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 92062 bytes -33539 bytes (-26.70%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 95734 bytes -29867 bytes (-23.78%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 105563 bytes -20038 bytes (-15.95%)
Brotli (Wikipedia) brotli brotli -q 11 109293 bytes -16308 bytes (-12.98%)
LZMA2 (Wikipedia) xz xz -9 111256 bytes -14345 bytes (-11.42%)
ZSTD (Wikipedia) zstd zstd -19 114641 bytes -10960 bytes (-8.73%)

Detailled Analysis

I wrote a DEFLATE decoder in Javascript. Click the button below to start a client-side analysis of the smallest gzipped files (may take a second):


Notes: pigz is a fast open source multi-threaded implementation of gzip written by one of the original authors of gzip.
However, when using compression level 11, pigz actually switches to the slower Zopfli algorithm and isn't multi-threaded anymore.
KrzyMOD's extensions to Zopfli offer the highest level of configuration and is therefore used for my brute-force search.
Ken Silverman wrote the closed-source KZIP compression program and Jonathon Fowler ported it to Linux.
Defluff was created by Joachim Henke; DeflOpt is a tool by Ben Jos Walbeehm.

website made by Stephan Brumme in 2015 and still improving in 2018.
all timestamps are displayed in central european time. see my changelog.
no flash, not even images or external css files - and everything squeezed into a single html file.
which was handsomely compressed before releasing it into the wild internet - obviously.

please visit my homepage and my blog, too.
email: minime (at) stephan-brumme.com