Choose a version:
20% The original file has 2600725 bytes (2,539.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 526408 bytes (514.1k, 20%).

After GZIP compression these minified files vary in size:
Boot
  162488 bytes (158.7k)
CDN, direct link
cdnjs
  132637 bytes (129.5k)
CDN, direct link
gzip -6 (default)
  130762 bytes (127.7k)
local copy
gzip -9
  130273 bytes (127.2k)
local copy
jsdelivr
  129573 bytes (126.5k)
CDN, direct link
7zip -mx=9 -tgzip
  125782 bytes (122.8k)
local copy
libdeflate -12
  125614 bytes (122.7k)
local copy
pigz -11 -n
  125518 bytes (122.6k)
local copy
kzip -s0 -rn -b5
  125264 bytes (122.3k)
local copy
Zopfli
  125234 bytes (122.3k)
local copy
Zopfli (defluff)
  125231 bytes (122.3k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.10.0.min.js

You will automatically get the smallest Ember 2.10.0 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 4339 bytes by using my Ember 2.10.0 Zopfli version instead of the best available CDN (3.46% smaller than jsdelivr, 125234 vs. 129573 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 --i100000 --mb8 --mls16384 --bsr4 --lazy --ohh

(found November 29, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 16384  --mls16384
block splitting recursion 4  --bsr4
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 3 more bytes (125231 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.10.0/ember.min.js --location | md5sum
984ab5bf8fc6be18f2f362dcc3d1525d  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.10.0.min.zopfli.js.gz | md5sum
984ab5bf8fc6be18f2f362dcc3d1525d  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.10.0/ember.min.js --location | sha1sum
3446c66a00d0bd408cf4eda57cf308d0a44215ca  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.10.0.min.zopfli.js.gz | sha1sum
3446c66a00d0bd408cf4eda57cf308d0a44215ca  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 162488 bytes 984ab5bf8fc6be18f2f362dcc3d1525d December 2, 2016 @ 03:42
cdnjs 132637 bytes 984ab5bf8fc6be18f2f362dcc3d1525d November 29, 2016 @ 07:32

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
jsdelivr 129573 bytes 4347beeac987b2c14d56237b0b2e9eaa < !function(){function e(e,t){e.prototype=Object.create(t&&t [...]
< try{if(r.isTesting()||(i.Namespace.processAll(),i.setNames [...]
< }}),s("ember-glimmer/helpers/-html-safe",["exports","ember [...]
< return t},e.prototype.didCreateElement=function(){},e.prot [...]
< var r=this._chains,i=void 0;void 0===r?r=this._chains=new [...]
< "constructor"!==l&&o.hasOwnProperty(l)&&(h=r[l],c=o[l],h!= [...]
< "use strict";function s(){return this}function a(e,t){if(! [...]
< }:function(e){return n.get(e,t)===r},m(e+".@each."+t,i)}fu [...]
< var e=t.get(this,"arrangedContent");e&&s.addArrayObserver( [...]
< t.run._addQueue("afterRender","render")}),s("ember-views/s [...]
[...]
(invalid)

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
125234 bytes -3 bytes zopfli --i100000 --mls16384 --bsr4 --lazy --ohh November 29, 2016 @ 16:24
125237 bytes -13 bytes zopfli --i10000 --mls16384 --bsr4 --lazy --ohh November 29, 2016 @ 13:28
125250 bytes -23 bytes zopfli --i1000 --mls16384 --bsr4 --lazy --ohh November 29, 2016 @ 13:10
125273 bytes zopfli --i100 --mls16384 --bsr4 --lazy --ohh November 29, 2016 @ 11:48

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

Most recent activity on January 25, 2017 @ 15:29.

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 100,000.
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
125383 125383 125383 125383 125384 125384 125384 125384 125296 125345 125378 125378 125383 125327 125384
125311 125309 125383 125383 125384 125384 125384 125292 125263 125257 125258 125378 125383 125234 125384
125318 125314 125317 125323 125317 125321 125316 125321 125305 125291 125313 125266 125307 125255 125307
125245 125304 125320 125315 125316 125315 125315 125319 125293 125330 125266 125378 125383 125253 125323
125316 125320 125315 125320 125317 125315 125320 125319 125293 125272 125270 125378 125298 125254 125307
125315 125315 125315 125321 125314 125320 125313 125313 125301 125261 125273 125264 125301 125256 125312
125320 125319 125315 125315 125321 125315 125321 125319 125301 125261 125269 125255 125293 125255 125307
125319 125314 125315 125315 125318 125315 125315 125319 125315 125254 125273 125272 125294 125255 125307
125320 125319 125320 125314 125332 125317 125319 125314 125304 125258 125278 125260 125300 125254 125305
125317 125322 125315 125315 125315 125315 125321 125319 125305 125273 125281 125298 125301 125252 125319
125255 125258 125334 125315 125305 125306 125307 125319 125314 125259 125271 125311 125305 125252 125307
125320 125319 125321 125315 125318 125313 125315 125319 125315 125260 125272 125265 125303 125253 125327
125315 125315 125315 125315 125320 125319 125320 125314 125304 125255 125277 125270 125300 125243 125307
125320 125319 125315 125315 125316 125321 125315 125319 125315 125252 125282 125256 125300 125252 125316
125318 125314 125320 125315 125320 125317 125321 125319 125303 125264 125281 125266 125305 125258 125306
125319 125315 125321 125316 125314 125321 125306 125319 125306 125298 125272 125263 125305 125250 125306
125318 125314 125321 125315 125315 125318 125319 125315 125307 125274 125276 125260 125299 125256 125318
125319 125314 125315 125315 125320 125320 125321 125316 125304 125300 125259 125255 125301 125255 125307
125319 125314 125315 125315 125314 125317 125315 125314 125305 125286 125283 125258 125297 125254 125306
125318 125314 125315 125315 125318 125315 125321 125314 125308 125258 125257 125255 125298 125257 125307
125319 125314 125315 125315 125321 125316 125320 125317 125302 125264 125277 125255 125297 125251 125306
125319 125315 125314 125315 125315 125317 125315 125318 125316 125261 125257 125262 125301 125253 125307
125317 125322 125315 125315 125315 125319 125320 125317 125317 125267 125272 125264 125299 125271 125306

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 125273 bytes 100%
1,000 125250 bytes -23 bytes 100%
10,000 125237 bytes -13 bytes 100%
100,000 125234 bytes -3 bytes 0.87%
1,000,000
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
125338 bytes +104 bytes (+0.08%) +74 bytes
125356 bytes +122 bytes (+0.10%) +92 bytes
125391 bytes +157 bytes (+0.13%) +127 bytes
125401 bytes +167 bytes (+0.13%) +137 bytes
125342 bytes +108 bytes (+0.09%) +78 bytes
125264 bytes +30 bytes (+0.02%)
125335 bytes +101 bytes (+0.08%) +71 bytes
125350 bytes +116 bytes (+0.09%) +86 bytes
125397 bytes +163 bytes (+0.13%) +133 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 84927 bytes -40307 bytes (-32.19%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 91870 bytes -33364 bytes (-26.64%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 95470 bytes -29764 bytes (-23.77%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 105352 bytes -19882 bytes (-15.88%)
Brotli (Wikipedia) brotli brotli -q 11 109141 bytes -16093 bytes (-12.85%)
LZMA2 (Wikipedia) xz xz -9 111004 bytes -14230 bytes (-11.36%)
ZSTD (Wikipedia) zstd zstd -19 114397 bytes -10837 bytes (-8.65%)

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