Choose a version:
23% The original file has 1487331 bytes (1,452.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 336940 bytes (329.0k, 23%).

After GZIP compression these minified files vary in size:
Boot
  113871 bytes (111.2k)
CDN
cdnjs
  94267 bytes (92.1k)
CDN
gzip -6 (default)
  92886 bytes (90.7k)
local copy
cdnhttps
  92813 bytes (90.6k)
CDN
gzip -9
  92617 bytes (90.4k)
local copy
7zip -mx=9 -tgzip
  89566 bytes (87.5k)
local copy
libdeflate -12
  89443 bytes (87.3k)
local copy
pigz -11 -n
  89334 bytes (87.2k)
local copy
kzip -s0 -rn -b0
  89264 bytes (87.2k)
local copy
Zopfli
  89158 bytes (87.1k)
local copy
Zopfli (defluff)
  89156 bytes (87.1k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.6.0.min.js

You will automatically get the smallest Ember 1.6.0 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 3655 bytes by using my Ember 1.6.0 Zopfli version instead of the best available CDN (4.10% smaller than cdnhttps, 89158 vs. 92813 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 --mls4096 --bsr14 --lazy --ohh

(found July 22, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 4096  --mls4096
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 (89156 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v1.6.0/ember.min.js --location | md5sum
3a8df2f694ad4bada09a4a9892dc9972  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.6.0.min.zopfli.js.gz | md5sum
3a8df2f694ad4bada09a4a9892dc9972  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v1.6.0/ember.min.js --location | sha1sum
a962c3628d1e0a773d6160d0ba9249aaca8d2b27  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.6.0.min.zopfli.js.gz | sha1sum
a962c3628d1e0a773d6160d0ba9249aaca8d2b27  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 113871 bytes 3a8df2f694ad4bada09a4a9892dc9972 March 19, 2015 @ 18:11
cdnjs 94267 bytes 3a8df2f694ad4bada09a4a9892dc9972 July 8, 2014 @ 11:45
cdnhttps 92813 bytes 3a8df2f694ad4bada09a4a9892dc9972 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
89158 bytes -1 byte zopfli --i100000 --mls4096 --bsr14 --lazy --ohh July 22, 2016 @ 20:04
89159 bytes -4 bytes zopfli --i10000 --mls4096 --bsr14 --lazy --ohh November 20, 2015 @ 22:55
89163 bytes -2 bytes zopfli --i10000 --mls8192 --bsr14 --lazy --ohh October 2, 2015 @ 06:53
89165 bytes -10 bytes zopfli --i1000 --mls8192 --bsr14 --lazy --ohh October 2, 2015 @ 01:19
89175 bytes zopfli --i100 --mls8192 --bsr14 --lazy --ohh September 30, 2015 @ 10:11

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

Most recent activity on March 26, 2017 @ 22:58.

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
89200 89201 89200 89195 89201 89199 89198 89193 89198 89195 89198 89200 89197 89201 89288
89184 89184 89197 89177 89173 89206 89182 89178 89238 89195 89196 89195 89170 89198 89213
89203 89181 89185 89184 89199 89197 89183 89176 89199 89198 89201 89198 89209 89201 89198
89175 89177 89201 89178 89177 89176 89214 89178 89197 89198 89193 89199 89217 89197 89207
89199 89198 89183 89179 89198 89179 89196 89193 89200 89160 89195 89203 89207 89201 89206
89202 89202 89204 89203 89199 89180 89198 89175 89201 89173 89196 89203 89160 89198 89206
89182 89179 89180 89176 89197 89196 89178 89196 89202 89173 89194 89198 89207 89201 89205
89180 89180 89183 89167 89175 89175 89173 89173 89201 89160 89194 89197 89209 89197 89210
89184 89180 89182 89171 89174 89176 89174 89201 89241 89237 89202 89203 89207 89206 89207
89176 89183 89184 89167 89175 89177 89177 89177 89201 89171 89195 89203 89213 89200 89206
89181 89182 89187 89175 89175 89176 89198 89200 89199 89168 89194 89158 89163 89197 89211
89171 89173 89201 89173 89178 89177 89178 89175 89201 89176 89194 89203 89208 89200 89203
89178 89168 89183 89206 89177 89179 89179 89178 89200 89201 89198 89199 89208 89198 89211
89184 89183 89198 89206 89174 89177 89196 89201 89201 89182 89194 89203 89161 89200 89206
89184 89181 89197 89172 89193 89179 89199 89175 89200 89176 89194 89196 89164 89200 89206
89172 89175 89194 89175 89196 89176 89198 89175 89192 89173 89194 89203 89205 89198 89211
89182 89178 89177 89172 89176 89183 89179 89175 89201 89174 89194 89203 89194 89206 89208
89180 89183 89183 89206 89172 89161 89180 89175 89201 89237 89195 89203 89213 89200 89210
89183 89185 89183 89172 89199 89176 89199 89176 89201 89171 89197 89197 89213 89197 89217
89183 89182 89184 89172 89176 89173 89180 89175 89199 89171 89237 89203 89210 89200 89214
89181 89183 89192 89167 89166 89200 89180 89196 89202 89176 89198 89203 89166 89201 89206
89180 89197 89183 89176 89175 89174 89180 89173 89197 89176 89198 89198 89217 89205 89218
89182 89181 89184 89168 89198 89199 89196 89196 89200 89193 89195 89197 89164 89200 89205

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 89175 bytes 100%
1,000 89165 bytes -10 bytes 100%
10,000 89159 bytes -6 bytes 100%
100,000 89158 bytes -1 byte 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
89264 bytes +106 bytes (+0.12%)
89265 bytes +107 bytes (+0.12%) +1 byte
89266 bytes +108 bytes (+0.12%) +2 bytes
89321 bytes +163 bytes (+0.18%) +57 bytes
89355 bytes +197 bytes (+0.22%) +91 bytes
89404 bytes +246 bytes (+0.28%) +140 bytes
89440 bytes +282 bytes (+0.32%) +176 bytes
89491 bytes +333 bytes (+0.37%) +227 bytes
89525 bytes +367 bytes (+0.41%) +261 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 61802 bytes -27356 bytes (-30.68%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 66201 bytes -22957 bytes (-25.75%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 70115 bytes -19043 bytes (-21.36%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 75268 bytes -13890 bytes (-15.58%)
Brotli (Wikipedia) brotli brotli -q 11 77483 bytes -11675 bytes (-13.09%)
LZMA2 (Wikipedia) xz xz -9 79400 bytes -9758 bytes (-10.94%)
ZSTD (Wikipedia) zstd zstd -19 81663 bytes -7495 bytes (-8.41%)

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