Choose a version:
26% The original file has 1641490 bytes (1,603.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 427979 bytes (417.9k, 26%).

After GZIP compression these minified files vary in size:
Boot
  139355 bytes (136.1k)
CDN, direct link
cdnjs
  114350 bytes (111.7k)
CDN, direct link
gzip -6 (default)
  112744 bytes (110.1k)
local copy
gzip -9
  112400 bytes (109.8k)
local copy
cdnhttps
  112184 bytes (109.6k)
CDN, direct link
7zip -mx=9 -tgzip
  108433 bytes (105.9k)
local copy
libdeflate -12
  108335 bytes (105.8k)
local copy
pigz -11 -n
  108317 bytes (105.8k)
local copy
kzip -s0 -rn -b3
  108146 bytes (105.6k)
local copy
Zopfli
  108122 bytes (105.6k)
local copy
Zopfli (defluff)
  108120 bytes (105.6k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.6.2.min.js

You will automatically get the smallest Ember 2.6.2 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 4062 bytes by using my Ember 2.6.2 Zopfli version instead of the best available CDN (3.76% smaller than cdnhttps, 108122 vs. 112184 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 --mls16 --bsr12 --lazy --ohh

(found July 15, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 16  --mls16
block splitting recursion 12  --bsr12
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 2 more bytes (108120 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.6.2/ember.min.js --location | md5sum
161770a8d270b6840209b9430cbe24a5  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.6.2.min.zopfli.js.gz | md5sum
161770a8d270b6840209b9430cbe24a5  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.6.2/ember.min.js --location | sha1sum
37c62bf76ba33ec3b6fe2ae09d7611701db37d38  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.6.2.min.zopfli.js.gz | sha1sum
37c62bf76ba33ec3b6fe2ae09d7611701db37d38  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 139355 bytes 161770a8d270b6840209b9430cbe24a5 July 13, 2016 @ 08:21
cdnjs 114350 bytes 161770a8d270b6840209b9430cbe24a5 July 13, 2016 @ 00:31
cdnhttps 112184 bytes 161770a8d270b6840209b9430cbe24a5 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:

2.13.3, 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
108122 bytes -1 byte zopfli --i1000000 --mls16 --bsr12 --lazy --ohh July 15, 2016 @ 09:26
108123 bytes -1 byte zopfli --i10000 --mls16 --bsr14 --lazy --ohh July 13, 2016 @ 13:55
108124 bytes -1 byte zopfli --i1000 --mls16 --bsr14 --lazy --ohh July 13, 2016 @ 13:35
108125 bytes -1 byte zopfli --i1000 --mls2048 --bsr23 --lazy --ohh July 13, 2016 @ 13:06
108126 bytes -1 byte zopfli --i1000 --mls4096 --bsr6 --lazy --ohh July 13, 2016 @ 13:05
108127 bytes -17 bytes zopfli --i1000 --mls4096 --bsr2 --lazy --ohh July 13, 2016 @ 13:05
108144 bytes zopfli --i100 --mls4096 --bsr2 --lazy --ohh July 13, 2016 @ 11:58

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 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
108128 108130 108128 108130 108128 108135 108128 108126 108128 108128 108183 108127 108136 108136 108129
108125 108125 108126 108122 108125 108125 108125 108128 108125 108125 108125 108126 108135 108136 108134
108125 108125 108125 108125 108125 108124 108124 108128 108125 108124 108126 108126 108140 108139 108135
108124 108124 108127 108122 108126 108125 108125 108126 108125 108126 108125 108125 108137 108135 108135
108126 108126 108126 108122 108125 108126 108125 108126 108124 108125 108125 108125 108136 108136 108137
108126 108125 108127 108125 108127 108125 108125 108128 108124 108125 108125 108124 108135 108134 108134
108125 108125 108126 108125 108125 108124 108124 108128 108125 108124 108125 108128 108135 108133 108134
108125 108125 108129 108125 108125 108125 108124 108127 108125 108125 108125 108130 108135 108135 108134
108125 108125 108126 108122 108126 108124 108125 108126 108125 108126 108125 108124 108138 108136 108135
108125 108125 108126 108125 108125 108124 108125 108126 108124 108125 108125 108126 108134 108134 108133
108124 108124 108127 108122 108125 108125 108124 108126 108125 108126 108125 108126 108138 108133 108135
108124 108125 108127 108125 108125 108124 108125 108128 108125 108125 108125 108125 108134 108138 108132
108124 108125 108127 108124 108127 108125 108125 108128 108124 108125 108133 108128 108135 108138 108134
108128 108126 108127 108128 108127 108126 108125 108127 108125 108124 108125 108128 108138 108135 108133
108125 108125 108126 108125 108126 108125 108126 108128 108127 108126 108127 108127 108126 108133 108136
108125 108126 108126 108124 108127 108125 108125 108126 108125 108129 108132 108125 108134 108133 108136
108126 108125 108127 108125 108125 108125 108125 108128 108125 108125 108125 108125 108135 108133 108134
108125 108125 108126 108125 108125 108124 108124 108126 108125 108125 108125 108125 108135 108136 108136
108125 108125 108127 108122 108125 108125 108127 108128 108125 108125 108125 108125 108138 108134 108133
108125 108125 108127 108126 108127 108125 108127 108128 108125 108124 108125 108125 108138 108135 108128
108125 108125 108126 108122 108125 108124 108124 108128 108125 108124 108125 108125 108137 108132 108133
108147 108125 108127 108124 108126 108125 108127 108127 108125 108126 108124 108129 108135 108135 108134
108124 108125 108127 108125 108127 108126 108127 108128 108125 108125 108125 108128 108133 108133 108135

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 108144 bytes 100%
1,000 108124 bytes -20 bytes 100%
10,000 108123 bytes -1 byte 100%
100,000 108123 bytes 2.03%
1,000,000 108122 bytes -1 byte 2.03%
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
108146 bytes +24 bytes (+0.02%)
108151 bytes +29 bytes (+0.03%) +5 bytes
108198 bytes +76 bytes (+0.07%) +52 bytes
108146 bytes +24 bytes (+0.02%)
108220 bytes +98 bytes (+0.09%) +74 bytes
108257 bytes +135 bytes (+0.12%) +111 bytes
108311 bytes +189 bytes (+0.17%) +165 bytes
108346 bytes +224 bytes (+0.21%) +200 bytes
108383 bytes +261 bytes (+0.24%) +237 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 74242 bytes -33880 bytes (-31.33%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 79225 bytes -28897 bytes (-26.73%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 85349 bytes -22773 bytes (-21.06%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 90262 bytes -17860 bytes (-16.52%)
Brotli (Wikipedia) brotli brotli -q 11 94221 bytes -13901 bytes (-12.86%)
LZMA2 (Wikipedia) xz xz -9 96372 bytes -11750 bytes (-10.87%)
ZSTD (Wikipedia) zstd zstd -19 99117 bytes -9005 bytes (-8.33%)

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