Choose a version:
27% The original file has 1717816 bytes (1,677.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 458110 bytes (447.4k, 27%).

After GZIP compression these minified files vary in size:
Boot
  144681 bytes (141.3k)
CDN
cdnjs
  118817 bytes (116.0k)
CDN
gzip -6 (default)
  116982 bytes (114.2k)
local copy
gzip -9
  116583 bytes (113.9k)
local copy
cdnhttps
  116476 bytes (113.7k)
CDN
7zip -mx=9 -tgzip
  112790 bytes (110.1k)
local copy
libdeflate -12
  112756 bytes (110.1k)
local copy
pigz -11 -n
  112532 bytes (109.9k)
local copy
kzip -s0 -rn -b5
  112426 bytes (109.8k)
local copy
Zopfli
  112330 bytes (109.7k)
local copy
Zopfli (defluff)
  112326 bytes (109.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.4.1.min.js (or via HTTPS)

You will automatically get the smallest Ember 2.4.1 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 4146 bytes by using my Ember 2.4.1 Zopfli version instead of the best available CDN (3.69% smaller than cdnhttps, 112330 vs. 116476 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 --mls128 --bsr15 --lazy --ohh

(found March 3, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 15  --bsr15
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 (112326 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://builds.emberjs.com/tags/v2.4.1/ember.min.js --location | md5sum
7ad552032617730490437caa28a6fdd3  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.4.1.min.zopfli.js.gz | md5sum
7ad552032617730490437caa28a6fdd3  -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v2.4.1/ember.min.js --location | sha1sum
7a39919d06fabe670d86f92d59b57a0406222181  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.4.1.min.zopfli.js.gz | sha1sum
7a39919d06fabe670d86f92d59b57a0406222181  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 144681 bytes 7ad552032617730490437caa28a6fdd3 March 3, 2016 @ 11:32
cdnjs 118817 bytes 7ad552032617730490437caa28a6fdd3 March 1, 2016 @ 18:32
cdnhttps 116476 bytes 7ad552032617730490437caa28a6fdd3 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
112330 bytes -4 bytes zopfli --i1000000 --mls128 --bsr15 --lazy --ohh March 3, 2016 @ 15:33
112334 bytes -6 bytes zopfli --i100000 --mls128 --bsr15 --lazy --ohh March 1, 2016 @ 21:22
112340 bytes -2 bytes zopfli --i10000 --mls128 --bsr15 --lazy --ohh March 1, 2016 @ 17:56
112342 bytes -9 bytes zopfli --i10000 --mls32 --bsr22 --lazy --ohh March 1, 2016 @ 14:49
112351 bytes -2 bytes zopfli --i1000 --mls64 --bsr30 --lazy --ohh March 1, 2016 @ 14:47
112353 bytes -1 byte zopfli --i1000 --mls4096 --bsr21 --lazy --ohh March 1, 2016 @ 14:08
112354 bytes -4 bytes zopfli --i1000 --mls4096 --bsr40 --lazy --ohh March 1, 2016 @ 14:05
112358 bytes -21 bytes zopfli --i1000 --mls4096 --bsr11 --lazy --ohh March 1, 2016 @ 14:03
112379 bytes zopfli --i100 --mls4096 --bsr40 --lazy --ohh March 1, 2016 @ 13:39

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, 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
112458 112459 112457 112452 112470 112452 112474 112465 112467 112470 112461 112464 112464 112466 112468
112370 112369 112458 112379 112392 112371 112400 112404 112368 112390 112467 112464 112466 112382 112454
112361 112363 112358 112354 112373 112377 112374 112385 112389 112389 112382 112470 112364 112367 112463
112457 112457 112461 112460 112338 112461 112335 112458 112461 112466 112374 112367 112346 112366 112453
112461 112461 112461 112458 112347 112461 112344 112459 112459 112466 112355 112350 112347 112373 112455
112355 112461 112458 112460 112348 112461 112462 112461 112462 112466 112468 112348 112367 112456 112454
112353 112461 112461 112461 112337 112345 112461 112459 112461 112466 112358 112348 112347 112454 112453
112460 112461 112461 112461 112347 112345 112343 112462 112461 112459 112376 112344 112348 112454 112455
112461 112461 112461 112462 112370 112344 112370 112458 112460 112466 112374 112348 112363 112455 112455
112464 112458 112350 112461 112350 112350 112371 112458 112459 112459 112361 112346 112348 112454 112461
112352 112461 112458 112460 112343 112345 112371 112459 112461 112459 112377 112372 112351 112454 112453
112464 112459 112458 112460 112335 112461 112330 112459 112461 112466 112376 112363 112347 112454 112453
112462 112461 112461 112461 112342 112344 112342 112459 112460 112459 112357 112343 112347 112454 112456
112461 112462 112462 112458 112461 112456 112331 112459 112462 112466 112376 112365 112347 112456 112454
112461 112366 112462 112461 112348 112461 112370 112458 112459 112461 112356 112462 112348 112453 112455
112464 112371 112370 112463 112461 112463 112373 112460 112462 112466 112377 112350 112371 112454 112455
112465 112465 112467 112463 112458 112461 112349 112458 112458 112459 112377 112347 112348 112455 112454
112461 112462 112352 112462 112349 112346 112462 112458 112459 112459 112376 112344 112360 112454 112455
112461 112367 112461 112462 112338 112461 112461 112458 112461 112466 112358 112347 112347 112454 112457
112460 112461 112461 112461 112350 112457 112461 112459 112461 112459 112365 112348 112360 112454 112453
112461 112461 112461 112461 112337 112462 112461 112459 112461 112466 112375 112343 112346 112454 112457
112461 112462 112462 112461 112345 112335 112335 112459 112460 112462 112364 112349 112346 112454 112454
112460 112462 112458 112462 112348 112461 112367 112458 112462 112459 112359 112347 112349 112491 112453

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 112379 bytes 100%
1,000 112351 bytes -28 bytes 100%
10,000 112340 bytes -11 bytes 100%
100,000 112333 bytes -7 bytes 2.90%
1,000,000 112330 bytes -3 bytes 0.58%
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
112535 bytes +205 bytes (+0.18%) +109 bytes
112486 bytes +156 bytes (+0.14%) +60 bytes
112542 bytes +212 bytes (+0.19%) +116 bytes
112569 bytes +239 bytes (+0.21%) +143 bytes
112460 bytes +130 bytes (+0.12%) +34 bytes
112426 bytes +96 bytes (+0.09%)
112469 bytes +139 bytes (+0.12%) +43 bytes
112518 bytes +188 bytes (+0.17%) +92 bytes
112566 bytes +236 bytes (+0.21%) +140 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 76613 bytes -35717 bytes (-31.80%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 82047 bytes -30283 bytes (-26.96%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 88442 bytes -23888 bytes (-21.27%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 93433 bytes -18897 bytes (-16.82%)
Brotli (Wikipedia) brotli brotli -q 11 97512 bytes -14818 bytes (-13.19%)
LZMA2 (Wikipedia) xz xz -9 99796 bytes -12534 bytes (-11.16%)
Zstandard (Wikipedia) zstd zstd -19 102599 bytes -9731 bytes (-8.66%)

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