Choose a version:
23% The original file has 1507279 bytes (1,472.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 341087 bytes (333.1k, 23%).

After GZIP compression these minified files vary in size:
Boot
  117024 bytes (114.3k)
CDN, direct link
cdnjs
  97372 bytes (95.1k)
CDN, direct link
gzip -6 (default)
  96115 bytes (93.9k)
local copy
cdnhttps
  96029 bytes (93.8k)
CDN, direct link
gzip -9
  95824 bytes (93.6k)
local copy
7zip -mx=9 -tgzip
  92765 bytes (90.6k)
local copy
libdeflate -12
  92611 bytes (90.4k)
local copy
pigz -11 -n
  92564 bytes (90.4k)
local copy
kzip -s0 -rn -b0
  92436 bytes (90.3k)
local copy
Zopfli
  92387 bytes (90.2k)
local copy
Zopfli (defluff)
  92386 bytes (90.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.7.1.min.js

You will automatically get the smallest Ember 1.7.1 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 3642 bytes by using my Ember 1.7.1 Zopfli version instead of the best available CDN (3.94% smaller than cdnhttps, 92387 vs. 96029 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 --mls256 --bsr15 --lazy --ohh

(found July 19, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 256  --mls256
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 1 more byte (92386 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v1.7.1/ember.min.js --location | md5sum
d7e1a38fba80c2a68757ff2c7c43cd09  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.7.1.min.zopfli.js.gz | md5sum
d7e1a38fba80c2a68757ff2c7c43cd09  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v1.7.1/ember.min.js --location | sha1sum
c936705797beee5919c9e20b972da0fc51da4bc3  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.7.1.min.zopfli.js.gz | sha1sum
c936705797beee5919c9e20b972da0fc51da4bc3  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 117024 bytes d7e1a38fba80c2a68757ff2c7c43cd09 March 19, 2015 @ 18:29
cdnjs 97372 bytes d7e1a38fba80c2a68757ff2c7c43cd09 October 24, 2014 @ 10:00
cdnhttps 96029 bytes d7e1a38fba80c2a68757ff2c7c43cd09 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:

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
92387 bytes -1 byte zopfli --i100000 --mls256 --bsr15 --lazy --ohh July 19, 2016 @ 16:58
92388 bytes -1 byte zopfli --i10000 --mls256 --bsr15 --lazy --ohh November 21, 2015 @ 14:24
92389 bytes -3 bytes zopfli --i10000 --mls64 --bsr12 --lazy --ohh November 21, 2015 @ 13:57
92392 bytes -4 bytes zopfli --i1000 --mls64 --bsr12 --lazy --ohh September 12, 2015 @ 18:59
92396 bytes -13 bytes zopfli --i1000 --mls2048 --bsr13 --lazy --ohh September 11, 2015 @ 00:35
92409 bytes -3 bytes zopfli --i1000 --mls1024 --bsr13 --lazy --ohh September 11, 2015 @ 00:29
92412 bytes -1 byte zopfli --i1000 --mls1024 --bsr10 --lazy --ohh September 11, 2015 @ 00:22
92413 bytes -5 bytes zopfli --i1000 --mls512 --bsr16 --lazy --ohh September 11, 2015 @ 00:20
92418 bytes -14 bytes zopfli --i1000 --mls512 --bsr2 --lazy --ohh September 11, 2015 @ 00:20
92432 bytes -23 bytes zopfli --i1000 --mls512 --bsr14 --lazy --ohh September 11, 2015 @ 00:19
92455 bytes zopfli --i100 --mls2048 --bsr9 --lazy --ohh September 10, 2015 @ 13:59

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 @ 12:27.

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 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
92396 92398 92398 92463 92398 92396 92397 92398 92394 92399 92398 92463 92463 92463 92402
92396 92396 92395 92396 92396 92396 92396 92395 92391 92397 92388 92401 92403 92395 92402
92397 92388 92391 92393 92396 92387 92390 92397 92388 92387 92389 92397 92402 92407 92398
92397 92396 92389 92390 92394 92390 92396 92391 92388 92387 92397 92398 92402 92406 92402
92392 92396 92412 92393 92392 92399 92389 92391 92473 92387 92390 92400 92403 92444 92399
92391 92391 92392 92392 92391 92390 92394 92395 92392 92387 92390 92396 92397 92419 92397
92393 92391 92391 92391 92396 92393 92394 92388 92391 92390 92391 92398 92395 92407 92402
92403 92393 92388 92392 92398 92393 92390 92388 92390 92391 92398 92409 92405 92407 92401
92391 92398 92391 92390 92393 92389 92394 92388 92392 92389 92388 92400 92397 92407 92401
92394 92396 92393 92398 92395 92396 92394 92391 92391 92390 92390 92400 92401 92408 92395
92394 92396 92393 92395 92394 92387 92394 92390 92391 92387 92389 92401 92401 92405 92395
92395 92397 92392 92389 92395 92387 92394 92387 92391 92392 92393 92401 92395 92406 92403
92395 92393 92391 92391 92389 92391 92389 92388 92391 92396 92397 92400 92395 92406 92402
92390 92395 92392 92392 92396 92387 92390 92391 92391 92391 92398 92398 92399 92445 92397
92391 92398 92396 92392 92396 92387 92390 92390 92392 92391 92416 92395 92393 92445 92400
92395 92394 92396 92392 92394 92387 92390 92390 92391 92387 92398 92398 92398 92405 92402
92396 92395 92391 92391 92392 92389 92390 92390 92397 92389 92398 92400 92395 92408 92400
92396 92392 92391 92391 92396 92394 92393 92388 92391 92387 92390 92400 92397 92407 92400
92394 92395 92398 92390 92396 92390 92390 92391 92391 92387 92390 92395 92397 92405 92396
92392 92392 92391 92389 92396 92393 92394 92390 92391 92387 92390 92399 92402 92405 92402
92394 92398 92391 92390 92394 92390 92394 92390 92392 92387 92390 92400 92396 92405 92403
92393 92391 92391 92390 92392 92390 92389 92392 92391 92391 92390 92400 92398 92411 92396
92393 92392 92396 92391 92396 92390 92394 92391 92388 92388 92398 92401 92395 92445 92408

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 92444 bytes 100%
1,000 92392 bytes -52 bytes 100%
10,000 92387 bytes -5 bytes 100%
100,000 92387 bytes 5.80%
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
92436 bytes +49 bytes (+0.05%)
92448 bytes +61 bytes (+0.07%) +12 bytes
92497 bytes +110 bytes (+0.12%) +61 bytes
92521 bytes +134 bytes (+0.15%) +85 bytes
92562 bytes +175 bytes (+0.19%) +126 bytes
92589 bytes +202 bytes (+0.22%) +153 bytes
92511 bytes +124 bytes (+0.13%) +75 bytes
92544 bytes +157 bytes (+0.17%) +108 bytes
92505 bytes +118 bytes (+0.13%) +69 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 65285 bytes -27102 bytes (-29.34%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 69244 bytes -23143 bytes (-25.05%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 73201 bytes -19186 bytes (-20.77%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 78608 bytes -13779 bytes (-14.91%)
Brotli (Wikipedia) brotli brotli -q 11 81084 bytes -11303 bytes (-12.23%)
LZMA2 (Wikipedia) xz xz -9 83252 bytes -9135 bytes (-9.89%)
ZSTD (Wikipedia) zstd zstd -19 85792 bytes -6595 bytes (-7.14%)

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 2017.
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