Choose a version:
27% The original file has 1672895 bytes (1,633.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 445885 bytes (435.4k, 27%).

After GZIP compression these minified files vary in size:
Boot
  140714 bytes (137.4k)
CDN
gzip -6 (default)
  114106 bytes (111.4k)
local copy
gzip -9
  113705 bytes (111.0k)
local copy
cdnhttps
  113561 bytes (110.9k)
CDN
cdnjs
  113561 bytes (110.9k)
CDN
7zip -mx=9 -tgzip
  109870 bytes (107.3k)
local copy
libdeflate -12
  109790 bytes (107.2k)
local copy
pigz -11 -n
  109671 bytes (107.1k)
local copy
kzip -s0 -rn -b7
  109610 bytes (107.0k)
local copy
Zopfli
  109471 bytes (106.9k)
local copy
Zopfli (defluff)
  109467 bytes (106.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.2.2.min.js

You will automatically get the smallest Ember 2.2.2 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 4090 bytes by using my Ember 2.2.2 Zopfli version instead of the best available CDN (3.74% smaller than cdnjs, 109471 vs. 113561 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 --mls32 --bsr7 --lazy --ohh

(found January 25, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 32  --mls32
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 (109467 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.2.2/ember.min.js --location | md5sum
8ce6f078b750f68557492fadf254eabf  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.2.2.min.zopfli.js.gz | md5sum
8ce6f078b750f68557492fadf254eabf  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.2.2/ember.min.js --location | sha1sum
1d7e6e9e0b37126cda6184678485d94d253d1842  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.2.2.min.zopfli.js.gz | sha1sum
1d7e6e9e0b37126cda6184678485d94d253d1842  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 140714 bytes 8ce6f078b750f68557492fadf254eabf January 18, 2016 @ 16:50
cdnhttps 113561 bytes 8ce6f078b750f68557492fadf254eabf November 22, 2016 @ 16:33
cdnjs 113561 bytes 8ce6f078b750f68557492fadf254eabf January 18, 2016 @ 07:02

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
109471 bytes -1 byte zopfli --i100000 --mls32 --bsr7 --lazy --ohh January 25, 2016 @ 12:49
109472 bytes -3 bytes zopfli --i10000 --mls32 --bsr7 --lazy --ohh January 25, 2016 @ 09:54
109475 bytes -25 bytes zopfli --i1000 --mls32 --bsr7 --lazy --ohh January 25, 2016 @ 09:27
109500 bytes zopfli --i100 --mls32 --bsr7 --lazy --ohh January 25, 2016 @ 09:24

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
109539 109540 109673 109661 109541 109529 109598 109516 109518 109598 109608 109676 109691 109661 109671
109516 109525 109513 109620 109531 109597 109608 109504 109607 109508 109523 109625 109607 109543 109618
109529 109531 109528 109545 109516 109509 109517 109501 109540 109516 109522 109503 109510 109506 109600
109619 109617 109622 109624 109471 109623 109510 109514 109504 109519 109514 109521 109530 109614 109621
109619 109622 109606 109612 109616 109491 109613 109515 109512 109508 109543 109520 109602 109605 109621
109609 109617 109606 109614 109505 109615 109531 109505 109511 109508 109517 109518 109511 109607 109621
109625 109629 109606 109609 109629 109615 109607 109533 109517 109511 109517 109523 109511 109618 109621
109619 109621 109621 109622 109507 109620 109530 109517 109506 109520 109520 109522 109606 109609 109621
109609 109617 109626 109621 109491 109606 109613 109511 109505 109502 109519 109519 109519 109607 109605
109619 109626 109626 109619 109624 109611 109541 109518 109518 109511 109512 109602 109512 109630 109621
109619 109621 109607 109624 109510 109612 109607 109513 109511 109513 109503 109523 109518 109630 109616
109619 109621 109622 109622 109503 109505 109607 109522 109512 109513 109521 109617 109512 109630 109621
109621 109621 109606 109620 109516 109477 109607 109516 109517 109506 109514 109515 109606 109607 109621
109621 109612 109622 109622 109624 109624 109612 109507 109506 109504 109513 109521 109606 109618 109607
109606 109604 109626 109620 109514 109516 109611 109518 109520 109512 109518 109525 109605 109607 109621
109621 109621 109611 109620 109517 109624 109514 109515 109514 109513 109615 109611 109606 109603 109621
109628 109628 109606 109621 109506 109623 109621 109506 109517 109510 109514 109520 109514 109603 109605
109619 109621 109621 109609 109500 109623 109539 109513 109511 109507 109522 109516 109510 109609 109619
109619 109626 109626 109621 109623 109623 109512 109506 109510 109506 109512 109521 109606 109607 109621
109619 109621 109621 109609 109517 109506 109607 109512 109508 109520 109519 109516 109606 109630 109620
109619 109626 109606 109622 109517 109505 109607 109512 109509 109517 109538 109522 109606 109607 109621
109606 109621 109617 109606 109510 109612 109615 109516 109519 109505 109520 109522 109512 109630 109612
109619 109621 109606 109618 109480 109606 109531 109534 109504 109505 109519 109519 109607 109607 109621

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 109500 bytes 100%
1,000 109475 bytes -25 bytes 100%
10,000 109472 bytes -3 bytes 100%
100,000 109471 bytes -1 byte 1.16%
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
109702 bytes +231 bytes (+0.21%) +92 bytes
109651 bytes +180 bytes (+0.16%) +41 bytes
109685 bytes +214 bytes (+0.20%) +75 bytes
109688 bytes +217 bytes (+0.20%) +78 bytes
109642 bytes +171 bytes (+0.16%) +32 bytes
109641 bytes +170 bytes (+0.16%) +31 bytes
109658 bytes +187 bytes (+0.17%) +48 bytes
109610 bytes +139 bytes (+0.13%)
109680 bytes +209 bytes (+0.19%) +70 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 74719 bytes -34752 bytes (-31.75%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 79921 bytes -29550 bytes (-26.99%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 86022 bytes -23449 bytes (-21.42%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 90863 bytes -18608 bytes (-17.00%)
Brotli (Wikipedia) brotli brotli -q 11 94940 bytes -14531 bytes (-13.27%)
LZMA2 (Wikipedia) xz xz -9 97116 bytes -12355 bytes (-11.29%)
ZSTD (Wikipedia) zstd zstd -19 99876 bytes -9595 bytes (-8.76%)

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