Choose a version:
27% The original file has 1672930 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 445842 bytes (435.4k, 27%).

After GZIP compression these minified files vary in size:
Boot
  140704 bytes (137.4k)
CDN
cdnjs
  115741 bytes (113.0k)
CDN
gzip -6 (default)
  114105 bytes (111.4k)
local copy
cdnhttps
  113996 bytes (111.3k)
CDN
gzip -9
  113697 bytes (111.0k)
local copy
jsdelivr
  113676 bytes (111.0k)
CDN
7zip -mx=9 -tgzip
  109866 bytes (107.3k)
local copy
libdeflate -12
  109826 bytes (107.3k)
local copy
pigz -11 -n
  109673 bytes (107.1k)
local copy
kzip -s0 -rn -b7
  109597 bytes (107.0k)
local copy
Zopfli
  109458 bytes (106.9k)
local copy
Zopfli (defluff)
  109455 bytes (106.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.2.0.min.js (or via HTTPS)

You will automatically get the smallest Ember 2.2.0 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 4218 bytes by using my Ember 2.2.0 Zopfli version instead of the best available CDN (3.85% smaller than jsdelivr, 109458 vs. 113676 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 --i1000000 --mb8 --mls32 --bsr7 --lazy --ohh

(found November 19, 2015)
Description Value Parameter
iterations 1000000  --i1000000
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 3 more bytes (109455 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://builds.emberjs.com/tags/v2.2.0/ember.min.js --location | md5sum
9648d77bd34cae873c735f328a557a54  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.2.0.min.zopfli.js.gz | md5sum
9648d77bd34cae873c735f328a557a54  -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v2.2.0/ember.min.js --location | sha1sum
9349af3c22d694629f33458208e0d2155c650ae9  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.2.0.min.zopfli.js.gz | sha1sum
9349af3c22d694629f33458208e0d2155c650ae9  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 140704 bytes 9648d77bd34cae873c735f328a557a54 December 1, 2015 @ 19:39
cdnjs 115741 bytes 9648d77bd34cae873c735f328a557a54 November 18, 2015 @ 03:35
cdnhttps 113996 bytes 9648d77bd34cae873c735f328a557a54 December 24, 2015 @ 07:33
jsdelivr 113676 bytes 9648d77bd34cae873c735f328a557a54 November 17, 2015 @ 03:05

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
109458 bytes -7 bytes zopfli --i1000000 --mls32 --bsr7 --lazy --ohh November 19, 2015 @ 09:44
109465 bytes -8 bytes zopfli --i100000 --mls32 --bsr7 --lazy --ohh November 17, 2015 @ 19:38
109473 bytes -12 bytes zopfli --i10000 --mls32 --bsr7 --lazy --ohh November 17, 2015 @ 10:42
109485 bytes -13 bytes zopfli --i1000 --mls32 --bsr7 --lazy --ohh November 17, 2015 @ 10:20
109498 bytes zopfli --i100 --mls32 --bsr7 --lazy --ohh November 17, 2015 @ 09:07

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

Most recent activity on July 22, 2016 @ 15:27.

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, 100,000 or 1,000,000.
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
109537 109535 109676 109675 109545 109536 109599 109536 109518 109599 109609 109664 109676 109676 109676
109507 109517 109517 109603 109523 109606 109533 109594 109504 109596 109538 109603 109600 109546 109616
109526 109523 109514 109519 109516 109506 109506 109511 109515 109506 109511 109527 109508 109505 109596
109617 109604 109619 109621 109458 109602 109616 109510 109529 109514 109510 109516 109510 109611 109603
109617 109626 109608 109602 109618 109487 109605 109516 109500 109516 109518 109520 109508 109613 109603
109604 109604 109608 109606 109511 109617 109616 109513 109516 109512 109512 109520 109508 109600 109603
109492 109624 109624 109618 109503 109617 109618 109505 109504 109508 109545 109524 109510 109618 109603
109617 109603 109603 109619 109514 109618 109616 109513 109502 109504 109510 109523 109509 109617 109603
109604 109604 109623 109616 109489 109604 109611 109504 109502 109511 109518 109525 109515 109600 109603
109623 109616 109623 109618 109485 109611 109616 109503 109504 109516 109547 109595 109500 109618 109602
109617 109623 109621 109618 109513 109611 109618 109506 109542 109516 109518 109509 109519 109618 109617
109617 109623 109619 109619 109512 109510 109618 109510 109504 109517 109503 109604 109513 109618 109603
109611 109603 109608 109614 109516 109470 109618 109505 109503 109515 109518 109524 109509 109600 109603
109622 109608 109617 109619 109486 109514 109618 109509 109505 109499 109518 109523 109511 109618 109617
109625 109604 109625 109616 109513 109512 109627 109514 109504 109503 109512 109525 109508 109600 109603
109484 109613 109617 109618 109514 109621 109616 109508 109505 109506 109614 109598 109509 109616 109603
109490 109607 109608 109614 109515 109602 109619 109512 109505 109503 109505 109598 109531 109616 109603
109617 109623 109617 109618 109616 109519 109619 109502 109515 109513 109520 109520 109508 109617 109616
109489 109616 109623 109603 109624 109621 109618 109507 109506 109516 109502 109510 109509 109600 109603
109617 109623 109603 109618 109515 109515 109608 109505 109502 109504 109505 109510 109508 109618 109600
109489 109616 109608 109619 109525 109508 109618 109511 109505 109505 109512 109509 109512 109600 109603
109617 109605 109617 109610 109501 109611 109614 109504 109502 109509 109503 109510 109508 109618 109604
109617 109623 109608 109603 109477 109604 109604 109509 109507 109508 109512 109510 109516 109600 109602

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 109498 bytes 100%
1,000 109485 bytes -13 bytes 100%
10,000 109473 bytes -12 bytes 100%
100,000 109465 bytes -8 bytes 0.87%
1,000,000 109458 bytes -7 bytes 0.29%
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
109664 bytes +206 bytes (+0.19%) +67 bytes
109611 bytes +153 bytes (+0.14%) +14 bytes
109669 bytes +211 bytes (+0.19%) +72 bytes
109681 bytes +223 bytes (+0.20%) +84 bytes
109628 bytes +170 bytes (+0.16%) +31 bytes
109601 bytes +143 bytes (+0.13%) +4 bytes
109637 bytes +179 bytes (+0.16%) +40 bytes
109597 bytes +139 bytes (+0.13%)
109651 bytes +193 bytes (+0.18%) +54 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 74715 bytes -34743 bytes (-31.74%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 79922 bytes -29536 bytes (-26.98%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 86028 bytes -23430 bytes (-21.41%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 90878 bytes -18580 bytes (-16.97%)
Brotli (Wikipedia) brotli brotli -q 11 94884 bytes -14574 bytes (-13.31%)
LZMA2 (Wikipedia) xz xz -9 97116 bytes -12342 bytes (-11.28%)
Zstandard (Wikipedia) zstd zstd -19 99869 bytes -9589 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