Choose a version:
29% The original file has 1440440 bytes (1,406.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 411573 bytes (401.9k, 29%).

After GZIP compression these minified files vary in size:
Boot
  132499 bytes (129.4k)
CDN
cdnjs
  127433 bytes (124.4k)
CDN
gzip -6 (default)
  107390 bytes (104.9k)
local copy
gzip -9
  107070 bytes (104.6k)
local copy
cdnhttps
  106876 bytes (104.4k)
CDN
7zip -mx=9 -tgzip
  103451 bytes (101.0k)
local copy
pigz -11 -n
  103211 bytes (100.8k)
local copy
libdeflate -12
  103177 bytes (100.8k)
local copy
kzip -s0 -rn -b0
  103035 bytes (100.6k)
local copy
Zopfli
  102994 bytes (100.6k)
local copy
Zopfli (defluff)
  102993 bytes (100.6k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.12.2.min.js (or via HTTPS)

You will automatically get the smallest Ember 1.12.2 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 3882 bytes by using my Ember 1.12.2 Zopfli version instead of the best available CDN (3.77% smaller than cdnhttps, 102994 vs. 106876 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 --mls4 --bsr11 --lazy --ohh

(found January 26, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 4  --mls4
block splitting recursion 11  --bsr11
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 (102993 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://builds.emberjs.com/tags/v1.12.2/ember.min.js --location | md5sum
7f9337679ba28d142ef9ac4174ffe09b  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.12.2.min.zopfli.js.gz | md5sum
7f9337679ba28d142ef9ac4174ffe09b  -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v1.12.2/ember.min.js --location | sha1sum
f01423b9ceba6b4b07c63349cf0bfe13e830bbd8  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.12.2.min.zopfli.js.gz | sha1sum
f01423b9ceba6b4b07c63349cf0bfe13e830bbd8  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 132499 bytes 7f9337679ba28d142ef9ac4174ffe09b January 16, 2016 @ 14:41
cdnjs 127433 bytes 7f9337679ba28d142ef9ac4174ffe09b January 15, 2016 @ 09:02
cdnhttps 106876 bytes 7f9337679ba28d142ef9ac4174ffe09b 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:

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
102994 bytes -3 bytes zopfli --i100000 --mls4 --bsr11 --lazy --ohh January 26, 2016 @ 18:44
102997 bytes -1 byte zopfli --i100000 --mls8192 --bsr19 --lazy --ohh January 26, 2016 @ 16:53
102998 bytes -2 bytes zopfli --i10000 --mls4 --bsr11 --lazy --ohh January 25, 2016 @ 14:02
103000 bytes -7 bytes zopfli --i10000 --mls32768 --bsr22 --lazy --ohh January 25, 2016 @ 10:27
103007 bytes -23 bytes zopfli --i1000 --mls32768 --bsr8 --lazy --ohh January 25, 2016 @ 09:47
103030 bytes zopfli --i100 --mls32768 --bsr8 --lazy --ohh January 25, 2016 @ 09:22

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

Most recent activity on March 28, 2017 @ 17:58.

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
103038 103038 103039 103039 103037 103039 103037 103039 103036 103042 103039 103040 103040 103065 103042
102997 103001 103002 103012 103014 103001 102999 103000 103000 103001 103000 103000 103005 103008 103007
103038 103034 103036 103034 103036 103036 103037 103036 103029 103005 103007 103040 103038 103043 103040
103001 103002 102998 103002 103001 103039 103000 103001 102998 102999 103003 103038 103049 103008 103011
103003 103002 103001 103004 103025 103000 102999 103001 103000 102995 103000 103002 103009 103008 103007
103035 103029 103005 103036 103035 103000 103000 102999 103000 103006 103000 103000 103010 103008 103009
103006 103004 103002 103003 103029 103000 102999 103001 103000 103000 103000 103000 103008 103008 103009
103032 102994 103030 103004 103026 103000 102996 103000 103000 103001 103000 103002 103010 103008 103004
103001 103001 103000 103013 103023 103001 102998 103001 103000 103000 103000 103001 103009 103009 103009
102997 103002 103002 103001 103021 103000 102995 103001 103000 103000 103001 103000 102995 103008 103008
103024 103029 103002 103001 103035 103003 102995 103001 103000 103000 103001 103000 103010 103008 103009
103005 103078 102998 103000 103022 103000 102996 103001 103000 103000 103001 103000 103010 103008 103009
103023 103023 103024 103023 103025 103000 103000 103002 103000 103000 103000 103004 103001 103008 103001
103002 103004 103002 102997 103023 103000 103000 103001 102999 102995 103000 103004 103003 103009 103010
103003 103001 103001 103002 103035 103001 103000 103000 103000 103000 102999 103001 102999 103008 103012
103023 103007 103003 103001 103023 103000 102999 103001 103069 103000 102999 103000 102997 103008 103009
103030 103022 103004 103021 103023 103003 103000 102999 103000 102999 103000 103002 102996 103008 103009
103022 103049 103035 103023 103028 103000 103003 103000 103000 102999 102999 103000 102995 103009 103004
103023 103005 103002 103005 103023 103000 102999 103001 102995 103000 103000 103001 103001 103008 103000
103005 103001 103000 103001 103001 103000 102999 103000 103000 103000 102999 102999 103010 103008 103008
103001 103001 103002 103001 103022 103000 102999 103000 103040 102999 103000 103001 103010 103008 103000
103002 103000 103003 103001 103002 103000 102995 103000 103000 103000 103001 103000 102999 103010 103001
103002 103001 103003 103002 103028 103002 103000 103001 103069 102999 103000 103000 102998 103008 103009

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 103030 bytes 100%
1,000 103002 bytes -28 bytes 100%
10,000 102997 bytes -5 bytes 100%
100,000 102994 bytes -3 bytes 4.64%
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
103035 bytes +41 bytes (+0.04%)
103047 bytes +53 bytes (+0.05%) +12 bytes
103088 bytes +94 bytes (+0.09%) +53 bytes
103123 bytes +129 bytes (+0.13%) +88 bytes
103162 bytes +168 bytes (+0.16%) +127 bytes
103147 bytes +153 bytes (+0.15%) +112 bytes
103175 bytes +181 bytes (+0.18%) +140 bytes
103166 bytes +172 bytes (+0.17%) +131 bytes
103212 bytes +218 bytes (+0.21%) +177 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
However, support for Brotli is constantly growing - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 71075 bytes -31919 bytes (-30.99%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 75791 bytes -27203 bytes (-26.41%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 80862 bytes -22132 bytes (-21.49%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 86288 bytes -16706 bytes (-16.22%)
Brotli (Wikipedia) brotli brotli -q 11 90107 bytes -12887 bytes (-12.51%)
LZMA2 (Wikipedia) xz xz -9 92068 bytes -10926 bytes (-10.61%)
Zstandard (Wikipedia) zstd zstd -19 94686 bytes -8308 bytes (-8.07%)

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