Choose a version:
31% The original file has 1582526 bytes (1,545.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 482768 bytes (471.5k, 31%).

After GZIP compression these minified files vary in size:
Boot
  151132 bytes (147.6k)
CDN, direct link
cdnjs
  124794 bytes (121.9k)
CDN, direct link
gzip -6 (default)
  123250 bytes (120.4k)
local copy
gzip -9
  122744 bytes (119.9k)
local copy
7zip -mx=9 -tgzip
  118499 bytes (115.7k)
local copy
libdeflate -12
  118482 bytes (115.7k)
local copy
pigz -11 -n
  118383 bytes (115.6k)
local copy
kzip -s0 -rn -b4
  118229 bytes (115.5k)
local copy
Zopfli
  118222 bytes (115.5k)
local copy
Zopfli (defluff)
  118220 bytes (115.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.14.1.min.js

You will automatically get the smallest Ember 2.14.1 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 6572 bytes by using my Ember 2.14.1 Zopfli version instead of the best available CDN (5.56% smaller than cdnjs, 118222 vs. 124794 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 --mls1024 --bsr7 --lazy --ohh

(found July 20, 2017)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 1024  --mls1024
block splitting recursion 7  --bsr7
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 (118220 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.14.1/ember.min.js --location | md5sum
3f2ff52ea3ce07aed41300e23eca72ee  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.14.1.min.zopfli.js.gz | md5sum
3f2ff52ea3ce07aed41300e23eca72ee  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.14.1/ember.min.js --location | sha1sum
04a020f35bea9bd8e8221692779e7ddad0269456  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.14.1.min.zopfli.js.gz | sha1sum
04a020f35bea9bd8e8221692779e7ddad0269456  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 151132 bytes 3f2ff52ea3ce07aed41300e23eca72ee July 17, 2017 @ 10:09
cdnjs 124794 bytes 3f2ff52ea3ce07aed41300e23eca72ee July 14, 2017 @ 18:18

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
118222 bytes -2 bytes zopfli --i1000000 --mls1024 --bsr7 --lazy --ohh July 20, 2017 @ 02:03
118224 bytes -3 bytes zopfli --i100000 --mls1024 --bsr7 --lazy --ohh July 18, 2017 @ 20:45
118227 bytes -1 byte zopfli --i100000 --mls64 --bsr14 --lazy --ohh July 18, 2017 @ 05:41
118228 bytes -2 bytes zopfli --i10000 --mls64 --bsr14 --lazy --ohh July 17, 2017 @ 22:49
118230 bytes -3 bytes zopfli --i1000 --mls64 --bsr14 --lazy --ohh July 17, 2017 @ 20:04
118233 bytes -8 bytes zopfli --i1000 --mls2048 --bsr23 --lazy --ohh July 17, 2017 @ 19:44
118241 bytes -3 bytes zopfli --i1000 --mls16384 --bsr7 --lazy --ohh July 17, 2017 @ 19:11
118244 bytes -2 bytes zopfli --i1000 --mls128 --bsr13 --lazy --ohh July 17, 2017 @ 18:50
118246 bytes -13 bytes zopfli --i1000 --mls64 --bsr20 --lazy --ohh July 17, 2017 @ 18:32
118259 bytes -5 bytes zopfli --i1000 --mls1024 --bsr7 --lazy --ohh July 17, 2017 @ 18:30
118264 bytes zopfli --i100 --mls4096 --bsr2 --lazy --ohh July 17, 2017 @ 18:16

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

Most recent activity on July 20, 2017 @ 07:46.

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
118259 118259 118258 118285 118255 118253 118253 118253 118248 118242 118260 118231 118341 118321 118261
118249 118247 118249 118248 118250 118250 118248 118249 118249 118233 118264 118237 118275 118244 118256
118246 118250 118246 118250 118250 118253 118248 118236 118235 118241 118275 118243 118243 118235 118237
118249 118246 118248 118248 118247 118245 118242 118230 118231 118222 118263 118239 118238 118237 118267
118250 118249 118248 118248 118246 118245 118246 118232 118235 118232 118261 118242 118241 118321 118234
118251 118247 118243 118248 118248 118247 118232 118235 118231 118232 118251 118234 118244 118241 118243
118248 118249 118246 118249 118245 118248 118242 118237 118239 118233 118232 118236 118245 118237 118238
118246 118250 118247 118247 118248 118247 118245 118229 118231 118231 118231 118232 118239 118240 118242
118250 118249 118247 118251 118248 118250 118230 118230 118234 118230 118250 118247 118241 118237 118242
118238 118238 118231 118232 118234 118232 118237 118233 118240 118233 118229 118239 118245 118236 118240
118250 118238 118243 118248 118230 118227 118246 118247 118239 118240 118230 118239 118248 118240 118254
118246 118245 118244 118247 118234 118246 118246 118248 118233 118232 118251 118239 118238 118236 118267
118237 118239 118243 118248 118237 118238 118244 118246 118239 118239 118238 118239 118245 118241 118248
118243 118244 118246 118248 118232 118242 118247 118245 118240 118240 118250 118241 118246 118238 118241
118243 118243 118244 118232 118236 118239 118247 118240 118240 118234 118231 118237 118243 118237 118250
118238 118246 118237 118248 118239 118238 118237 118233 118234 118235 118231 118239 118244 118239 118254
118243 118237 118243 118239 118239 118239 118236 118237 118238 118267 118240 118241 118238 118240 118242
118237 118239 118237 118248 118240 118237 118230 118239 118232 118267 118240 118241 118243 118238 118242
118244 118239 118245 118247 118235 118232 118246 118246 118239 118240 118229 118241 118242 118237 118240
118240 118246 118244 118246 118240 118247 118246 118248 118232 118240 118230 118239 118246 118238 118241
118244 118238 118237 118247 118234 118230 118237 118247 118237 118240 118250 118241 118242 118242 118254
118247 118238 118242 118248 118230 118230 118243 118242 118239 118238 118250 118240 118245 118241 118241
118242 118240 118243 118232 118229 118231 118246 118243 118240 118239 118230 118239 118244 118235 118246

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 118264 bytes 100%
1,000 118230 bytes -34 bytes 100%
10,000 118227 bytes -3 bytes 100%
100,000 118224 bytes -3 bytes 0.58%
1,000,000 118222 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
118300 bytes +78 bytes (+0.07%) +71 bytes
118302 bytes +80 bytes (+0.07%) +73 bytes
118295 bytes +73 bytes (+0.06%) +66 bytes
118282 bytes +60 bytes (+0.05%) +53 bytes
118229 bytes +7 bytes (+0.01%)
118279 bytes +57 bytes (+0.05%) +50 bytes
118326 bytes +104 bytes (+0.09%) +97 bytes
118327 bytes +105 bytes (+0.09%) +98 bytes
118354 bytes +132 bytes (+0.11%) +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 81284 bytes -36938 bytes (-31.24%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 88024 bytes -30198 bytes (-25.54%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 95014 bytes -23208 bytes (-19.63%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 101028 bytes -17194 bytes (-14.54%)
Brotli (Wikipedia) brotli brotli -q 11 103051 bytes -15171 bytes (-12.83%)
LZMA2 (Wikipedia) xz xz -9 104732 bytes -13490 bytes (-11.41%)
ZSTD (Wikipedia) zstd zstd -19 107796 bytes -10426 bytes (-8.82%)

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