Choose a version:
26% The original file has 1612935 bytes (1,575.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 418792 bytes (409.0k, 26%).

After GZIP compression these minified files vary in size:
Boot
  136494 bytes (133.3k)
CDN
cdnjs
  111969 bytes (109.3k)
CDN
gzip -6 (default)
  110396 bytes (107.8k)
local copy
gzip -9
  110044 bytes (107.5k)
local copy
jsdelivr
  109894 bytes (107.3k)
CDN
cdnhttps
  109855 bytes (107.3k)
CDN
7zip -mx=9 -tgzip
  106226 bytes (103.7k)
local copy
libdeflate -12
  106092 bytes (103.6k)
local copy
pigz -11 -n
  106091 bytes (103.6k)
local copy
kzip -s0 -rn -b3
  105888 bytes (103.4k)
local copy
Zopfli
  105847 bytes (103.4k)
local copy
Zopfli (defluff)
  105846 bytes (103.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.8.0.min.js

You will automatically get the smallest Ember 2.8.0 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 4008 bytes by using my Ember 2.8.0 Zopfli version instead of the best available CDN (3.79% smaller than cdnhttps, 105847 vs. 109855 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 --i10000 --mb8 --mls32 --bsr23 --lazy --ohh

(found September 8, 2016)
Description Value Parameter
iterations 10000  --i10000
maximum blocks 8  --mb8
maximum length score 32  --mls32
block splitting recursion 23  --bsr23
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 (105846 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.8.0/ember.min.js --location | md5sum
8eac616060fe6e9a18dacface90b0ac4  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.8.0.min.zopfli.js.gz | md5sum
8eac616060fe6e9a18dacface90b0ac4  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.8.0/ember.min.js --location | sha1sum
d737feb14be19596ff126753c46a5def23aad259  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.8.0.min.zopfli.js.gz | sha1sum
d737feb14be19596ff126753c46a5def23aad259  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 136494 bytes 8eac616060fe6e9a18dacface90b0ac4 September 8, 2016 @ 19:43
cdnjs 111969 bytes 8eac616060fe6e9a18dacface90b0ac4 September 8, 2016 @ 18:32
cdnhttps 109855 bytes 8eac616060fe6e9a18dacface90b0ac4 November 22, 2016 @ 16:33

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
jsdelivr 109894 bytes e4d340ef711383e0f3ef08fafc1508f6 < var t=e.createElementNS(o,"title");return t.innerHTML="<di [...]
< "use strict";e.default=n.default.extend({instrumentDisplay [...]
< return!0},render:function(e,t,n,i,o,a,s,u){var c=t.dom.get [...]
< init:function(e){var t=e.get("isTruthy");this.init(),this. [...]
< if(!this._volatile&&this._suspended!==e){var r=i.peekMeta( [...]
< return i.__ember_observesBefore__=o,i}e.detectBinding=x,e. [...]
< toString:function(){return"(generated "+t+" controller)"}} [...]
< })}function v(e,t){return i.computed(e,function(){var n=r. [...]
< }}function i(e,t){var r={},n={resolve:"resolveRegistration [...]
< }})}),e("ember-views/mixins/view_state_support",["exports" [...]
[...]
(invalid)

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
105847 bytes -1 byte zopfli --i10000 --mls32 --bsr23 --lazy --ohh September 8, 2016 @ 20:09
105848 bytes -12 bytes zopfli --i10000 --mls512 --bsr23 --lazy --ohh September 8, 2016 @ 19:07
105860 bytes -1 byte zopfli --i1000 --mls512 --bsr9 --lazy --ohh September 8, 2016 @ 18:33
105861 bytes -1 byte zopfli --i1000 --mls4 --bsr6 --lazy --ohh September 8, 2016 @ 18:32
105862 bytes -6 bytes zopfli --i1000 --mls2 --bsr10 --lazy --ohh September 8, 2016 @ 18:31
105868 bytes zopfli --i100 --mls4 --bsr19 --lazy --ohh September 8, 2016 @ 18:19

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 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
105853 105853 105853 105909 105908 105908 105854 105854 105853 105856 105854 105852 105859 105852 105857
105851 105852 105851 105849 105847 105847 105853 105848 105848 105853 105852 105849 105861 105857 105859
105848 105847 105848 105847 105847 105853 105853 105848 105848 105848 105848 105847 105860 105858 105856
105850 105850 105849 105849 105847 105848 105847 105848 105848 105853 105853 105848 105859 105857 105858
105850 105851 105851 105848 105851 105853 105854 105847 105848 105850 105847 105849 105859 105857 105859
105848 105848 105848 105848 105848 105847 105849 105848 105848 105849 105848 105847 105857 105858 105856
105848 105847 105848 105848 105848 105847 105853 105848 105848 105850 105847 105847 105857 105858 105857
105848 105847 105847 105848 105848 105847 105848 105847 105848 105850 105848 105847 105857 105857 105856
105847 105848 105848 105847 105847 105847 105849 105847 105848 105850 105848 105848 105858 105858 105856
105848 105847 105848 105848 105848 105848 105847 105850 105848 105848 105853 105847 105860 105859 105858
105847 105847 105848 105847 105848 105847 105847 105848 105848 105848 105848 105848 105860 105857 105857
105847 105847 105848 105847 105848 105848 105847 105848 105848 105852 105857 105848 105858 105856 105857
105848 105848 105847 105847 105848 105848 105848 105848 105848 105853 105853 105854 105857 105859 105857
105848 105847 105847 105848 105848 105847 105871 105849 105848 105853 105853 105853 105858 105858 105856
105848 105848 105848 105848 105848 105847 105871 105848 105848 105850 105848 105847 105871 105855 105856
105848 105847 105848 105847 105848 105847 105848 105847 105848 105853 105853 105850 105860 105857 105857
105847 105847 105851 105847 105848 105847 105848 105848 105848 105850 105853 105851 105858 105857 105859
105847 105847 105848 105857 105851 105848 105847 105848 105848 105849 105853 105848 105863 105857 105855
105847 105847 105847 105847 105848 105847 105853 105848 105848 105850 105848 105847 105860 105858 105855
105847 105847 105848 105847 105847 105847 105848 105848 105848 105852 105852 105848 105860 105860 105858
105848 105847 105848 105848 105848 105848 105847 105847 105848 105850 105847 105847 105858 105858 105857
105848 105848 105848 105848 105848 105847 105847 105848 105847 105850 105848 105847 105860 105857 105857
105848 105847 105848 105847 105848 105847 105847 105848 105848 105850 105848 105847 105859 105855 105856

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 105868 bytes 100%
1,000 105860 bytes -8 bytes 100%
10,000 105847 bytes -13 bytes 100%
100,000 105847 bytes 23.48%
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
105898 bytes +51 bytes (+0.05%) +10 bytes
105906 bytes +59 bytes (+0.06%) +18 bytes
105929 bytes +82 bytes (+0.08%) +41 bytes
105888 bytes +41 bytes (+0.04%)
105946 bytes +99 bytes (+0.09%) +58 bytes
105995 bytes +148 bytes (+0.14%) +107 bytes
106054 bytes +207 bytes (+0.20%) +166 bytes
106056 bytes +209 bytes (+0.20%) +168 bytes
106088 bytes +241 bytes (+0.23%) +200 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 72843 bytes -33004 bytes (-31.18%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 77749 bytes -28098 bytes (-26.55%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 83467 bytes -22380 bytes (-21.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 88418 bytes -17429 bytes (-16.47%)
Brotli (Wikipedia) brotli brotli -q 11 92684 bytes -13163 bytes (-12.44%)
LZMA2 (Wikipedia) xz xz -9 94812 bytes -11035 bytes (-10.43%)
ZSTD (Wikipedia) zstd zstd -19 97435 bytes -8412 bytes (-7.95%)

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