Choose a version:
27% The original file has 1718038 bytes (1,677.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 458128 bytes (447.4k, 27%).

After GZIP compression these minified files vary in size:
Boot
  144693 bytes (141.3k)
CDN
cdnjs
  118829 bytes (116.0k)
CDN
gzip -6 (default)
  116989 bytes (114.2k)
local copy
gzip -9
  116592 bytes (113.9k)
local copy
cdnhttps
  116486 bytes (113.8k)
CDN
libdeflate -12
  112849 bytes (110.2k)
local copy
7zip -mx=9 -tgzip
  112798 bytes (110.2k)
local copy
pigz -11 -n
  112535 bytes (109.9k)
local copy
kzip -s0 -rn -b5
  112440 bytes (109.8k)
local copy
Zopfli
  112338 bytes (109.7k)
local copy
Zopfli (defluff)
  112336 bytes (109.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.4.3.min.js

You will automatically get the smallest Ember 2.4.3 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 4148 bytes by using my Ember 2.4.3 Zopfli version instead of the best available CDN (3.69% smaller than cdnhttps, 112338 vs. 116486 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 --mls64 --bsr14 --lazy --ohh

(found March 20, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 14  --bsr14
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 2 more bytes (112336 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.4.3/ember.min.js --location | md5sum
53abf6b7f36bd58365b99f4959ab293d  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.4.3.min.zopfli.js.gz | md5sum
53abf6b7f36bd58365b99f4959ab293d  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.4.3/ember.min.js --location | sha1sum
32eb609e1ffc74902ca0803e31eed6292daa5105  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.4.3.min.zopfli.js.gz | sha1sum
32eb609e1ffc74902ca0803e31eed6292daa5105  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 144693 bytes 53abf6b7f36bd58365b99f4959ab293d May 3, 2016 @ 11:51
cdnjs 118829 bytes 53abf6b7f36bd58365b99f4959ab293d March 18, 2016 @ 09:31
cdnhttps 116486 bytes 53abf6b7f36bd58365b99f4959ab293d 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
112338 bytes -3 bytes zopfli --i1000000 --mls64 --bsr14 --lazy --ohh March 20, 2016 @ 12:08
112341 bytes -4 bytes zopfli --i100000 --mls64 --bsr14 --lazy --ohh March 19, 2016 @ 07:33
112345 bytes -4 bytes zopfli --i100000 --mls64 --bsr11 --lazy --ohh March 19, 2016 @ 05:04
112349 bytes -4 bytes zopfli --i10000 --mls64 --bsr11 --lazy --ohh March 18, 2016 @ 13:46
112353 bytes -1 byte zopfli --i10000 --mls32 --bsr20 --lazy --ohh March 18, 2016 @ 13:23
112354 bytes -6 bytes zopfli --i10000 --mls32 --bsr30 --lazy --ohh March 18, 2016 @ 12:55
112360 bytes -1 byte zopfli --i1000 --mls32 --bsr30 --lazy --ohh March 18, 2016 @ 12:33
112361 bytes -5 bytes zopfli --i1000 --mls64 --bsr11 --lazy --ohh March 18, 2016 @ 12:09
112366 bytes -19 bytes zopfli --i1000 --mls8 --bsr21 --lazy --ohh March 18, 2016 @ 12:00
112385 bytes -3 bytes zopfli --i1000 --mls8192 --bsr6 --lazy --ohh March 18, 2016 @ 11:59
112388 bytes zopfli --i100 --mls8 --bsr21 --lazy --ohh March 18, 2016 @ 11:51

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
112469 112468 112470 112462 112478 112461 112483 112474 112481 112471 112476 112472 112473 112474 112477
112376 112375 112465 112386 112382 112371 112414 112385 112376 112421 112394 112473 112474 112381 112466
112369 112369 112368 112367 112383 112372 112381 112395 112376 112371 112389 112394 112374 112389 112471
112470 112469 112469 112465 112469 112468 112354 112465 112468 112469 112370 112389 112379 112380 112462
112469 112469 112469 112469 112467 112470 112354 112469 112467 112469 112364 112377 112371 112383 112466
112361 112469 112366 112465 112352 112466 112381 112469 112469 112469 112387 112474 112376 112464 112465
112363 112469 112469 112469 112352 112352 112378 112469 112468 112469 112382 112474 112387 112462 112463
112469 112471 112469 112469 112352 112345 112345 112469 112468 112469 112385 112475 112377 112462 112466
112469 112469 112469 112537 112354 112352 112381 112465 112470 112469 112383 112474 112380 112463 112463
112467 112471 112365 112470 112357 112415 112381 112465 112467 112469 112367 112474 112378 112462 112470
112362 112469 112465 112465 112360 112338 112382 112469 112469 112469 112385 112374 112379 112462 112463
112468 112466 112465 112465 112353 112468 112352 112469 112468 112469 112367 112380 112378 112463 112463
112469 112469 112469 112469 112353 112352 112383 112470 112470 112469 112364 112474 112368 112462 112461
112469 112469 112364 112469 112353 112467 112356 112469 112469 112469 112386 112475 112387 112465 112466
112361 112469 112364 112469 112353 112468 112354 112465 112468 112470 112364 112473 112366 112462 112464
112471 112381 112377 112472 112464 112471 112392 112471 112470 112469 112386 112475 112378 112462 112466
112471 112471 112472 112472 112353 112466 112357 112465 112468 112469 112385 112474 112377 112463 112461
112469 112469 112363 112471 112353 112415 112383 112465 112467 112469 112384 112475 112378 112463 112466
112374 112469 112469 112537 112351 112469 112468 112465 112468 112469 112366 112474 112379 112462 112463
112469 112469 112362 112469 112464 112464 112470 112469 112468 112469 112365 112475 112379 112462 112463
112469 112469 112469 112470 112352 112471 112352 112469 112468 112469 112367 112473 112380 112462 112464
112469 112469 112467 112469 112354 112345 112352 112471 112470 112470 112368 112474 112380 112462 112461
112469 112469 112469 112465 112360 112468 112383 112469 112469 112469 112382 112474 112379 112464 112463

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 112388 bytes 100%
1,000 112359 bytes -29 bytes 100%
10,000 112349 bytes -10 bytes 100%
100,000 112341 bytes -8 bytes 1.16%
1,000,000 112338 bytes -3 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
112536 bytes +198 bytes (+0.18%) +96 bytes
112505 bytes +167 bytes (+0.15%) +65 bytes
112547 bytes +209 bytes (+0.19%) +107 bytes
112561 bytes +223 bytes (+0.20%) +121 bytes
112471 bytes +133 bytes (+0.12%) +31 bytes
112440 bytes +102 bytes (+0.09%)
112468 bytes +130 bytes (+0.12%) +28 bytes
112521 bytes +183 bytes (+0.16%) +81 bytes
112559 bytes +221 bytes (+0.20%) +119 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 76620 bytes -35718 bytes (-31.80%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 82028 bytes -30310 bytes (-26.98%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 88450 bytes -23888 bytes (-21.26%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 93308 bytes -19030 bytes (-16.94%)
Brotli (Wikipedia) brotli brotli -q 11 97545 bytes -14793 bytes (-13.17%)
LZMA2 (Wikipedia) xz xz -9 99812 bytes -12526 bytes (-11.15%)
ZSTD (Wikipedia) zstd zstd -19 102593 bytes -9745 bytes (-8.67%)

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