Choose a version:
28% The original file has 1831425 bytes (1,788.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 520115 bytes (507.9k, 28%).

After GZIP compression these minified files vary in size:
Boot
  166326 bytes (162.4k)
CDN, direct link
cdnjs
  136925 bytes (133.7k)
CDN, direct link
gzip -6 (default)
  135147 bytes (132.0k)
local copy
cdnhttps
  134983 bytes (131.8k)
CDN, direct link
gzip -9
  134690 bytes (131.5k)
local copy
7zip -mx=9 -tgzip
  130381 bytes (127.3k)
local copy
libdeflate -12
  130186 bytes (127.1k)
local copy
pigz -11 -n
  129975 bytes (126.9k)
local copy
kzip -s0 -rn -b1
  129863 bytes (126.8k)
local copy
Zopfli
  129825 bytes (126.8k)
local copy
Zopfli (defluff)
  129821 bytes (126.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.13.1.min.js

You will automatically get the smallest Ember 1.13.1 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 5158 bytes by using my Ember 1.13.1 Zopfli version instead of the best available CDN (3.97% smaller than cdnhttps, 129825 vs. 134983 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 --bsr7 --lazy --ohh

(found July 21, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 4  --mls4
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 4 more bytes (129821 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v1.13.1/ember.min.js --location | md5sum
7da52b2872b0a39ab7941a4317bda773  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.13.1.min.zopfli.js.gz | md5sum
7da52b2872b0a39ab7941a4317bda773  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v1.13.1/ember.min.js --location | sha1sum
3ff767f3c74b8cf1233a3a6b14f51cf4bea58285  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.13.1.min.zopfli.js.gz | sha1sum
3ff767f3c74b8cf1233a3a6b14f51cf4bea58285  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 166326 bytes 7da52b2872b0a39ab7941a4317bda773 June 17, 2015 @ 18:22
cdnjs 136925 bytes 7da52b2872b0a39ab7941a4317bda773 June 17, 2015 @ 11:16
cdnhttps 134983 bytes 7da52b2872b0a39ab7941a4317bda773 December 24, 2015 @ 07:33

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
129825 bytes -9 bytes zopfli --i100000 --mls4 --bsr7 --lazy --ohh July 21, 2016 @ 20:29
129834 bytes -4 bytes zopfli --i10000 --mls4 --bsr7 --lazy --ohh October 14, 2015 @ 00:44
129838 bytes -1 byte zopfli --i1000 --mls512 --bsr20 --lazy --ohh October 6, 2015 @ 11:43
129839 bytes -5 bytes zopfli --i1000 --mls4 --bsr14 --lazy --ohh October 6, 2015 @ 11:25
129844 bytes -1 byte zopfli --i1000 --mls512 --bsr25 --lazy --ohh October 6, 2015 @ 10:08
129845 bytes -23 bytes zopfli --i1000 --mls2048 --bsr8 --lazy --ohh October 6, 2015 @ 09:26
129868 bytes zopfli --i100 --mls2048 --bsr20 --lazy --ohh October 5, 2015 @ 10:28

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 @ 09:29.

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
129875 129875 129873 129915 129915 129915 129915 129915 129915 129915 129915 129915 129915 129915 129916
129831 129833 129834 129830 129840 129832 129834 129834 129841 129831 129842 129845 129915 129858 129916
129848 129846 129848 129848 129852 129915 129847 129847 129834 129846 129844 129915 129915 129857 129916
129831 129825 129844 129831 129832 129840 129835 129833 129845 129830 129832 129842 129915 129859 129854
129832 129834 129831 129830 129847 129846 129845 129834 129834 129833 129830 129852 129851 129845 129846
129845 129830 129844 129845 129844 129846 129844 129847 129833 129845 129832 129845 129847 129860 129846
129834 129834 129834 129830 129832 129846 129845 129833 129838 129832 129838 129839 129856 129861 129846
129845 129833 129844 129830 129832 129832 129832 129833 129836 129846 129834 129844 129852 129860 129849
129831 129834 129834 129834 129832 129832 129883 129833 129830 129830 129833 129832 129854 129881 129836
129832 129845 129830 129840 129832 129831 129845 129833 129833 129834 129831 129840 129840 129848 129848
129831 129838 129834 129841 129839 129830 129832 129832 129832 129832 129830 129840 129845 129860 129846
129831 129841 129844 129830 129839 129831 129834 129833 129845 129832 129831 129841 129839 129840 129846
129845 129834 129832 129839 129832 129834 129843 129833 129839 129839 129832 129840 129856 129860 129846
129838 129843 129834 129830 129844 129832 129835 129835 129833 129846 129832 129843 129855 129847 129854
129835 129834 129835 129846 129834 129836 129835 129832 129845 129832 129839 129843 129848 129849 129853
129831 129839 129832 129837 129832 129834 129883 129837 129840 129846 129838 129841 129854 129860 129836
129845 129834 129844 129834 129833 129832 129847 129846 129838 129847 129830 129839 129852 129881 129856
129831 129834 129833 129842 129844 129834 129835 129833 129833 129844 129845 129847 129859 129881 129846
129844 129834 129834 129830 129844 129845 129845 129833 129845 129830 129831 129844 129859 129849 129850
129831 129834 129844 129838 129832 129845 129844 129837 129832 129832 129830 129843 129846 129844 129848
129831 129834 129834 129834 129832 129831 129845 129833 129832 129832 129830 129840 129849 129845 129852
129845 129830 129844 129830 129838 129832 129839 129839 129833 129844 129831 129839 129854 129852 129846
129835 129834 129834 129831 129832 129831 129832 129833 129832 129832 129833 129838 129859 129857 129846

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 129868 bytes 100%
1,000 129838 bytes -30 bytes 100%
10,000 129830 bytes -8 bytes 100%
100,000 129825 bytes -5 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
129901 bytes +76 bytes (+0.06%) +38 bytes
129863 bytes +38 bytes (+0.03%)
129899 bytes +74 bytes (+0.06%) +36 bytes
129968 bytes +143 bytes (+0.11%) +105 bytes
129984 bytes +159 bytes (+0.12%) +121 bytes
129946 bytes +121 bytes (+0.09%) +83 bytes
129929 bytes +104 bytes (+0.08%) +66 bytes
129967 bytes +142 bytes (+0.11%) +104 bytes
129948 bytes +123 bytes (+0.09%) +85 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 88005 bytes -41820 bytes (-32.21%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 94178 bytes -35647 bytes (-27.46%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 102819 bytes -27006 bytes (-20.80%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 107224 bytes -22601 bytes (-17.41%)
Brotli (Wikipedia) brotli brotli -q 11 112156 bytes -17669 bytes (-13.61%)
LZMA2 (Wikipedia) xz xz -9 114576 bytes -15249 bytes (-11.75%)
ZSTD (Wikipedia) zstd zstd -19 117625 bytes -12200 bytes (-9.40%)

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