Choose a version:
23% The original file has 1546093 bytes (1,509.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 352887 bytes (344.6k, 23%).

After GZIP compression these minified files vary in size:
Boot
  121098 bytes (118.3k)
CDN
jsdelivr
  121098 bytes (118.3k)
CDN
cdnjs
  100793 bytes (98.4k)
CDN
gzip -6 (default)
  99510 bytes (97.2k)
local copy
cdnhttps
  99408 bytes (97.1k)
CDN
gzip -9
  99213 bytes (96.9k)
local copy
7zip -mx=9 -tgzip
  95907 bytes (93.7k)
local copy
pigz -11 -n
  95698 bytes (93.5k)
local copy
libdeflate -12
  95687 bytes (93.4k)
local copy
kzip -s0 -rn -b0
  95556 bytes (93.3k)
local copy
Zopfli
  95515 bytes (93.3k)
local copy
Zopfli (defluff)
  95514 bytes (93.3k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.8.0.min.js (or via HTTPS)

You will automatically get the smallest Ember 1.8.0 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 3893 bytes by using my Ember 1.8.0 Zopfli version instead of the best available CDN (4.08% smaller than cdnhttps, 95515 vs. 99408 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 --mls256 --bsr9 --lazy --ohh

(found March 25, 2017)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 256  --mls256
block splitting recursion 9  --bsr9
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 (95514 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://builds.emberjs.com/tags/v1.8.0/ember.min.js --location | md5sum
e7337b0f2ad0d7be1ce07a430655e8e0  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.8.0.min.zopfli.js.gz | md5sum
e7337b0f2ad0d7be1ce07a430655e8e0  -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v1.8.0/ember.min.js --location | sha1sum
574f8b25bc31a51a27dd1da2bb7e9e4ceff8d91c  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.8.0.min.zopfli.js.gz | sha1sum
574f8b25bc31a51a27dd1da2bb7e9e4ceff8d91c  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 121098 bytes e7337b0f2ad0d7be1ce07a430655e8e0 March 19, 2015 @ 18:30
jsdelivr 121098 bytes e7337b0f2ad0d7be1ce07a430655e8e0 October 28, 2014 @ 12:57
cdnjs 100793 bytes e7337b0f2ad0d7be1ce07a430655e8e0 October 28, 2014 @ 16:00
cdnhttps 99408 bytes e7337b0f2ad0d7be1ce07a430655e8e0 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:

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
95515 bytes -1 byte zopfli --i100000 --mls256 --bsr9 --lazy --ohh March 25, 2017 @ 04:35
95516 bytes -2 bytes zopfli --i100000 --mls4096 --bsr14 --lazy --ohh July 22, 2016 @ 17:57
95518 bytes -1 byte zopfli --i10000 --mls4096 --bsr14 --lazy --ohh October 21, 2015 @ 16:51
95519 bytes -1 byte zopfli --i10000 --mls4096 --bsr15 --lazy --ohh October 1, 2015 @ 11:54
95520 bytes -4 bytes zopfli --i1000 --mls4096 --bsr15 --lazy --ohh October 1, 2015 @ 11:40
95524 bytes -2 bytes zopfli --i10000 --mls32768 --bsr12 --lazy --ohh October 1, 2015 @ 11:21
95526 bytes -2 bytes zopfli --i1000 --mls32768 --bsr12 --lazy --ohh October 1, 2015 @ 10:53
95528 bytes -31 bytes zopfli --i1000 --mls32768 --bsr16 --lazy --ohh October 1, 2015 @ 10:52
95559 bytes zopfli --i100 --mls32768 --bsr16 --lazy --ohh September 30, 2015 @ 09:09

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 @ 17:29.

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
95525 95525 95526 95525 95522 95522 95523 95522 95601 95523 95521 95532 95522 95532 95535
95524 95522 95522 95523 95523 95524 95521 95523 95523 95524 95521 95522 95525 95538 95532
95521 95522 95574 95522 95522 95519 95521 95519 95523 95524 95520 95521 95531 95536 95528
95523 95520 95521 95520 95522 95524 95523 95521 95521 95521 95522 95520 95527 95534 95524
95522 95522 95521 95520 95525 95520 95522 95520 95521 95523 95522 95521 95529 95535 95530
95521 95522 95521 95524 95522 95520 95527 95515 95522 95521 95522 95529 95528 95532 95524
95522 95522 95522 95523 95522 95522 95523 95521 95521 95524 95522 95573 95524 95532 95528
95521 95521 95521 95521 95523 95525 95522 95520 95524 95525 95524 95521 95524 95532 95524
95523 95522 95519 95519 95523 95525 95527 95525 95520 95523 95530 95519 95523 95532 95524
95521 95524 95522 95521 95522 95521 95523 95520 95520 95523 95522 95528 95530 95532 95528
95521 95533 95522 95524 95522 95521 95524 95523 95522 95524 95520 95516 95528 95532 95532
95521 95515 95525 95520 95523 95526 95526 95524 95520 95578 95522 95519 95528 95536 95523
95521 95523 95521 95522 95573 95522 95523 95521 95519 95521 95520 95522 95528 95532 95525
95521 95522 95521 95520 95522 95522 95527 95521 95520 95524 95522 95522 95528 95532 95530
95521 95522 95522 95521 95523 95521 95523 95521 95614 95521 95523 95520 95529 95533 95528
95521 95523 95522 95520 95523 95523 95527 95520 95520 95521 95522 95532 95528 95532 95528
95521 95519 95521 95522 95523 95522 95527 95520 95520 95521 95522 95519 95525 95533 95530
95521 95522 95522 95520 95521 95522 95527 95520 95521 95521 95523 95520 95531 95532 95527
95521 95521 95522 95520 95522 95520 95523 95521 95522 95521 95523 95521 95527 95532 95528
95521 95522 95522 95520 95525 95524 95522 95520 95520 95524 95522 95519 95527 95532 95528
95521 95519 95519 95523 95525 95519 95523 95520 95520 95578 95522 95528 95532 95532 95526
95521 95522 95521 95519 95523 95525 95524 95521 95521 95522 95522 95519 95527 95532 95528
95522 95522 95522 95520 95523 95520 95524 95520 95519 95521 95523 95516 95527 95536 95530

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 95559 bytes 100%
1,000 95519 bytes -40 bytes 100%
10,000 95518 bytes -1 byte 100%
100,000 95515 bytes -3 bytes 1.45%
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
95556 bytes +41 bytes (+0.04%)
95563 bytes +48 bytes (+0.05%) +7 bytes
95613 bytes +98 bytes (+0.10%) +57 bytes
95677 bytes +162 bytes (+0.17%) +121 bytes
95662 bytes +147 bytes (+0.15%) +106 bytes
95669 bytes +154 bytes (+0.16%) +113 bytes
95612 bytes +97 bytes (+0.10%) +56 bytes
95658 bytes +143 bytes (+0.15%) +102 bytes
95614 bytes +99 bytes (+0.10%) +58 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 67382 bytes -28133 bytes (-29.45%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 71621 bytes -23894 bytes (-25.02%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 75511 bytes -20004 bytes (-20.94%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 81244 bytes -14271 bytes (-14.94%)
Brotli (Wikipedia) brotli brotli -q 11 84072 bytes -11443 bytes (-11.98%)
LZMA2 (Wikipedia) xz xz -9 86248 bytes -9267 bytes (-9.70%)
Zstandard (Wikipedia) zstd zstd -19 88700 bytes -6815 bytes (-7.14%)

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