Choose a version:
27% The original file has 1837561 bytes (1,794.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 497930 bytes (486.3k, 27%).

After GZIP compression these minified files vary in size:
Boot
  156079 bytes (152.4k)
CDN
cdnjs
  128244 bytes (125.2k)
CDN
gzip -6 (default)
  126338 bytes (123.4k)
local copy
cdnhttps
  126335 bytes (123.4k)
CDN
gzip -9
  125883 bytes (122.9k)
local copy
7zip -mx=9 -tgzip
  121908 bytes (119.1k)
local copy
libdeflate -12
  121753 bytes (118.9k)
local copy
pigz -11 -n
  121491 bytes (118.6k)
local copy
kzip -s0 -rn -b0
  121351 bytes (118.5k)
local copy
Zopfli
  121313 bytes (118.5k)
local copy
Zopfli (defluff)
  121311 bytes (118.5k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.13.9.min.js

You will automatically get the smallest Ember 1.13.9 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 5022 bytes by using my Ember 1.13.9 Zopfli version instead of the best available CDN (4.14% smaller than cdnhttps, 121313 vs. 126335 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 --mls2 --bsr15 --lazy --ohh

(found July 21, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2  --mls2
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 2 more bytes (121311 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v1.13.9/ember.min.js --location | md5sum
30e642033abfd9eed19be157c755ac3c  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.13.9.min.zopfli.js.gz | md5sum
30e642033abfd9eed19be157c755ac3c  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v1.13.9/ember.min.js --location | sha1sum
b82ba779d8bfbe677ffe75f00c8f32e14807e13c  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.13.9.min.zopfli.js.gz | sha1sum
b82ba779d8bfbe677ffe75f00c8f32e14807e13c  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 156079 bytes 30e642033abfd9eed19be157c755ac3c August 23, 2015 @ 09:19
cdnjs 128244 bytes 30e642033abfd9eed19be157c755ac3c August 23, 2015 @ 04:49
cdnhttps 126335 bytes 30e642033abfd9eed19be157c755ac3c 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
121313 bytes -2 bytes zopfli --i100000 --mls2 --bsr15 --lazy --ohh July 21, 2016 @ 16:48
121315 bytes -16 bytes zopfli --i10000 --mls2 --bsr15 --lazy --ohh October 5, 2015 @ 16:33
121331 bytes -2 bytes zopfli --i1000 --mls8 --bsr18 --lazy --ohh October 5, 2015 @ 16:22
121333 bytes -3 bytes zopfli --i1000 --mls2 --bsr15 --lazy --ohh October 5, 2015 @ 15:44
121336 bytes -3 bytes zopfli --i1000 --mls32 --bsr13 --lazy --ohh October 5, 2015 @ 15:43
121339 bytes -17 bytes zopfli --i1000 --mls8 --bsr15 --lazy --ohh October 5, 2015 @ 15:40
121356 bytes zopfli --i100 --mls32 --bsr25 --lazy --ohh October 5, 2015 @ 10:30

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 @ 09:18.

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
121384 121383 121480 121382 121478 121475 121476 121472 121529 121485 121484 121504 121523 121528 121482
121320 121319 121329 121352 121451 121369 121347 121349 121352 121349 121328 121504 121523 121340 121342
121329 121329 121317 121374 121354 121328 121322 121336 121336 121319 121340 121504 121523 121326 121413
121350 121319 121449 121377 121374 121325 121339 121329 121354 121327 121482 121504 121523 121330 121456
121341 121369 121458 121361 121323 121329 121452 121458 121450 121444 121450 121458 121523 121459 121378
121321 121341 121329 121328 121322 121341 121450 121449 121465 121450 121449 121458 121454 121457 121458
121330 121321 121324 121351 121341 121328 121453 121449 121461 121450 121450 121453 121460 121460 121459
121337 121362 121326 121369 121327 121338 121457 121471 121450 121455 121450 121459 121455 121459 121464
121344 121326 121328 121325 121324 121345 121443 121450 121449 121450 121450 121458 121455 121460 121457
121344 121379 121452 121357 121320 121330 121443 121449 121453 121450 121450 121459 121458 121459 121463
121323 121345 121326 121342 121325 121347 121457 121449 121450 121450 121450 121453 121461 121460 121457
121313 121329 121322 121371 121328 121342 121443 121449 121451 121444 121450 121453 121461 121458 121458
121322 121348 121326 121364 121322 121332 121455 121450 121451 121444 121458 121459 121454 121455 121457
121347 121373 121444 121369 121450 121337 121457 121449 121461 121450 121455 121453 121461 121461 121456
121316 121324 121318 121331 121328 121341 121457 121460 121455 121450 121457 121459 121456 121458 121467
121322 121325 121319 121326 121322 121319 121454 121454 121447 121450 121449 121459 121454 121458 121462
121350 121335 121445 121361 121326 121336 121450 121449 121444 121452 121449 121460 121456 121459 121459
121343 121355 121449 121377 121350 121342 121457 121449 121461 121455 121449 121450 121461 121460 121456
121371 121324 121349 121365 121450 121341 121453 121454 121460 121450 121450 121460 121457 121459 121457
121323 121326 121326 121373 121340 121342 121453 121458 121450 121449 121450 121459 121453 121459 121463
121371 121348 121323 121377 121319 121342 121448 121461 121450 121451 121450 121459 121458 121459 121459
121366 121371 121452 121378 121333 121341 121444 121459 121451 121451 121450 121450 121457 121458 121456
121324 121342 121330 121372 121451 121343 121452 121458 121461 121450 121450 121458 121456 121454 121457

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 121356 bytes 100%
1,000 121331 bytes -25 bytes 100%
10,000 121315 bytes -16 bytes 100%
100,000 121313 bytes -2 bytes 0.87%
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
121351 bytes +38 bytes (+0.03%)
121476 bytes +163 bytes (+0.13%) +125 bytes
121492 bytes +179 bytes (+0.15%) +141 bytes
121452 bytes +139 bytes (+0.11%) +101 bytes
121377 bytes +64 bytes (+0.05%) +26 bytes
121359 bytes +46 bytes (+0.04%) +8 bytes
121411 bytes +98 bytes (+0.08%) +60 bytes
121456 bytes +143 bytes (+0.12%) +105 bytes
121508 bytes +195 bytes (+0.16%) +157 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 82574 bytes -38739 bytes (-31.93%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 88700 bytes -32613 bytes (-26.88%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 96062 bytes -25251 bytes (-20.81%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 100951 bytes -20362 bytes (-16.78%)
Brotli (Wikipedia) brotli brotli -q 11 105427 bytes -15886 bytes (-13.10%)
LZMA2 (Wikipedia) xz xz -9 107656 bytes -13657 bytes (-11.26%)
ZSTD (Wikipedia) zstd zstd -19 110756 bytes -10557 bytes (-8.70%)

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