Choose a version:
26% The original file has 1642825 bytes (1,604.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 433287 bytes (423.1k, 26%).

After GZIP compression these minified files vary in size:
Boot
  139822 bytes (136.5k)
CDN, direct link
cdnjs
  114791 bytes (112.1k)
CDN, direct link
gzip -6 (default)
  113186 bytes (110.5k)
local copy
gzip -9
  112801 bytes (110.2k)
local copy
jsdelivr
  112743 bytes (110.1k)
CDN, direct link
cdnhttps
  112561 bytes (109.9k)
CDN, direct link
7zip -mx=9 -tgzip
  108962 bytes (106.4k)
local copy
pigz -11 -n
  108845 bytes (106.3k)
local copy
libdeflate -12
  108832 bytes (106.3k)
local copy
kzip -s0 -rn -b3
  108651 bytes (106.1k)
local copy
Zopfli
  108610 bytes (106.1k)
local copy
Zopfli (defluff)
  108609 bytes (106.1k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.6.0.min.js

You will automatically get the smallest Ember 2.6.0 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 3951 bytes by using my Ember 2.6.0 Zopfli version instead of the best available CDN (3.64% smaller than cdnhttps, 108610 vs. 112561 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 --mls64 --bsr6 --lazy --ohh

(found June 13, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 6  --bsr6
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 1 more byte (108609 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.6.0/ember.min.js --location | md5sum
3354edc620ccc1038612e26884f34c2d  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.6.0.min.zopfli.js.gz | md5sum
3354edc620ccc1038612e26884f34c2d  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.6.0/ember.min.js --location | sha1sum
f153f87a30544bb0c50ec9130933c341d3c4af17  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.6.0.min.zopfli.js.gz | sha1sum
f153f87a30544bb0c50ec9130933c341d3c4af17  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 139822 bytes 3354edc620ccc1038612e26884f34c2d June 9, 2016 @ 09:39
cdnjs 114791 bytes 3354edc620ccc1038612e26884f34c2d June 8, 2016 @ 17:16
jsdelivr 112743 bytes 3354edc620ccc1038612e26884f34c2d June 8, 2016 @ 17:03
cdnhttps 112561 bytes 3354edc620ccc1038612e26884f34c2d November 22, 2016 @ 16:33

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

Other Versions

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

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
108610 bytes -1 byte zopfli --i1000000 --mls64 --bsr6 --lazy --ohh June 13, 2016 @ 23:21
108611 bytes -2 bytes zopfli --i100000 --mls64 --bsr6 --lazy --ohh June 10, 2016 @ 07:47
108613 bytes -4 bytes zopfli --i100000 --mls256 --bsr22 --lazy --ohh June 10, 2016 @ 04:56
108617 bytes -4 bytes zopfli --i10000 --mls32768 --bsr6 --lazy --ohh June 9, 2016 @ 10:40
108621 bytes -2 bytes zopfli --i1000 --mls32768 --bsr6 --lazy --ohh June 9, 2016 @ 10:21
108623 bytes -2 bytes zopfli --i1000 --mls512 --bsr19 --lazy --ohh June 9, 2016 @ 10:20
108625 bytes -2 bytes zopfli --i1000 --mls16 --bsr12 --lazy --ohh June 9, 2016 @ 10:14
108627 bytes -14 bytes zopfli --i1000 --mls64 --bsr8 --lazy --ohh June 9, 2016 @ 10:14
108641 bytes zopfli --i100 --mls64 --bsr10 --lazy --ohh June 9, 2016 @ 10:03

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

Most recent activity on November 22, 2016 @ 16:33.

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
108627 108628 108628 108628 108625 108633 108622 108622 108622 108682 108682 108682 108680 108685 108622
108619 108619 108618 108620 108619 108610 108618 108617 108620 108631 108628 108622 108630 108633 108618
108619 108617 108618 108619 108618 108610 108617 108629 108618 108611 108619 108623 108627 108623 108617
108619 108618 108618 108618 108619 108618 108619 108617 108620 108619 108619 108632 108630 108621 108622
108618 108619 108619 108618 108612 108620 108618 108618 108616 108619 108619 108632 108630 108619 108622
108618 108618 108617 108618 108619 108619 108619 108619 108619 108619 108618 108619 108630 108619 108618
108619 108619 108619 108619 108617 108620 108619 108618 108620 108617 108619 108627 108628 108621 108622
108619 108619 108618 108619 108612 108619 108619 108618 108618 108617 108618 108632 108633 108624 108617
108618 108620 108617 108618 108619 108620 108619 108617 108618 108619 108626 108627 108632 108621 108622
108619 108619 108617 108619 108619 108619 108617 108618 108619 108617 108619 108627 108629 108623 108622
108618 108619 108618 108618 108612 108620 108619 108618 108619 108617 108619 108619 108630 108619 108622
108619 108619 108618 108618 108619 108620 108619 108619 108620 108617 108619 108632 108630 108623 108617
108618 108620 108617 108620 108618 108613 108620 108617 108619 108618 108625 108627 108638 108630 108622
108618 108620 108617 108619 108618 108613 108619 108618 108619 108622 108617 108628 108620 108622 108619
108619 108620 108618 108618 108619 108619 108618 108618 108619 108619 108619 108623 108630 108619 108618
108618 108618 108617 108619 108617 108619 108617 108618 108619 108617 108618 108622 108619 108620 108622
108618 108619 108617 108620 108619 108619 108619 108618 108618 108619 108624 108628 108619 108621 108622
108619 108619 108618 108619 108619 108619 108617 108617 108618 108617 108619 108628 108618 108619 108622
108619 108619 108619 108620 108619 108619 108618 108613 108620 108620 108627 108629 108632 108619 108616
108619 108619 108617 108618 108619 108620 108619 108619 108620 108617 108619 108632 108637 108623 108622
108619 108620 108619 108619 108619 108620 108619 108619 108618 108617 108626 108628 108630 108619 108622
108619 108619 108617 108619 108618 108613 108619 108618 108620 108620 108635 108621 108620 108621 108623
108618 108619 108619 108613 108612 108619 108612 108619 108617 108618 108618 108632 108618 108619 108617

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 108641 bytes 100%
1,000 108619 bytes -22 bytes 100%
10,000 108617 bytes -2 bytes 100%
100,000 108611 bytes -6 bytes 14.78%
1,000,000 108610 bytes -1 byte 0.87%
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
108654 bytes +44 bytes (+0.04%) +3 bytes
108653 bytes +43 bytes (+0.04%) +2 bytes
108695 bytes +85 bytes (+0.08%) +44 bytes
108651 bytes +41 bytes (+0.04%)
108714 bytes +104 bytes (+0.10%) +63 bytes
108771 bytes +161 bytes (+0.15%) +120 bytes
108806 bytes +196 bytes (+0.18%) +155 bytes
108830 bytes +220 bytes (+0.20%) +179 bytes
108886 bytes +276 bytes (+0.25%) +235 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 74376 bytes -34234 bytes (-31.52%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 79322 bytes -29288 bytes (-26.97%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 85779 bytes -22831 bytes (-21.02%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 90385 bytes -18225 bytes (-16.78%)
Brotli (Wikipedia) brotli brotli -q 11 94443 bytes -14167 bytes (-13.04%)
LZMA2 (Wikipedia) xz xz -9 96632 bytes -11978 bytes (-11.03%)
ZSTD (Wikipedia) zstd zstd -19 99385 bytes -9225 bytes (-8.49%)

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 2017.
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