Choose a version:
26% The original file has 1614813 bytes (1,577.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 419618 bytes (409.8k, 26%).

After GZIP compression these minified files vary in size:
Boot
  136675 bytes (133.5k)
CDN
cdnjs
  112080 bytes (109.5k)
CDN
gzip -6 (default)
  110505 bytes (107.9k)
local copy
gzip -9
  110146 bytes (107.6k)
local copy
cdnhttps
  109949 bytes (107.4k)
CDN
7zip -mx=9 -tgzip
  106304 bytes (103.8k)
local copy
pigz -11 -n
  106176 bytes (103.7k)
local copy
libdeflate -12
  106080 bytes (103.6k)
local copy
kzip -s0 -rn -b3
  105964 bytes (103.5k)
local copy
Zopfli
  105922 bytes (103.4k)
local copy
Zopfli (defluff)
  105921 bytes (103.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.9.1.min.js (or via HTTPS)

You will automatically get the smallest Ember 2.9.1 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 4027 bytes by using my Ember 2.9.1 Zopfli version instead of the best available CDN (3.80% smaller than cdnhttps, 105922 vs. 109949 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 --i10000 --mb8 --mls32 --bsr9 --lazy --ohh

(found November 2, 2016)
Description Value Parameter
iterations 10000  --i10000
maximum blocks 8  --mb8
maximum length score 32  --mls32
block splitting recursion 9  --bsr9
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 (105921 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://builds.emberjs.com/tags/v2.9.1/ember.min.js --location | md5sum
b9014e5f34693bca5716b6894becc1f1  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.9.1.min.zopfli.js.gz | md5sum
b9014e5f34693bca5716b6894becc1f1  -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v2.9.1/ember.min.js --location | sha1sum
cf8d940282b7001fbb33114fc37f8dd8c39c8cee  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-2.9.1.min.zopfli.js.gz | sha1sum
cf8d940282b7001fbb33114fc37f8dd8c39c8cee  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 136675 bytes b9014e5f34693bca5716b6894becc1f1 November 4, 2016 @ 12:58
cdnjs 112080 bytes b9014e5f34693bca5716b6894becc1f1 November 2, 2016 @ 15:47
cdnhttps 109949 bytes b9014e5f34693bca5716b6894becc1f1 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
105922 bytes -1 byte zopfli --i10000 --mls32 --bsr9 --lazy --ohh November 2, 2016 @ 01:22
105923 bytes -12 bytes zopfli --i10000 --mls4 --bsr18 --lazy --ohh November 2, 2016 @ 00:58
105935 bytes -1 byte zopfli --i1000 --mls32 --bsr6 --lazy --ohh November 1, 2016 @ 23:39
105936 bytes -12 bytes zopfli --i1000 --mls4096 --bsr6 --lazy --ohh November 1, 2016 @ 23:38
105948 bytes zopfli --i100 --mls64 --bsr12 --lazy --ohh November 1, 2016 @ 23:25

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

Most recent activity on January 25, 2017 @ 15:27.

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
105933 105933 105929 105933 105985 105930 105929 105930 105930 105930 105930 105928 105934 105926 105934
105930 105929 105931 105925 105925 105924 105923 105923 105923 105928 105929 105924 105934 105934 105934
105923 105923 105923 105923 105923 105923 105923 105923 105923 105925 105923 105925 105936 105936 105935
105923 105924 105923 105923 105923 105948 105923 105923 105923 105928 105929 105925 105933 105932 105933
105928 105928 105928 105925 105928 105930 105949 105923 105923 105925 105922 105925 105932 105932 105932
105922 105923 105923 105923 105922 105923 105923 105923 105923 105924 105923 105923 105931 105936 105932
105954 105928 105923 105923 105927 105923 105923 105923 105923 105925 105923 105923 105932 105936 105935
105923 105923 105923 105923 105923 105923 105923 105923 105923 105925 105924 105923 105934 105935 105935
105922 105923 105923 105923 105922 105923 105923 105923 105923 105924 105923 105923 105934 105937 105934
105922 105923 105923 105923 105922 105924 105923 105923 105923 105924 105923 105925 105931 105933 105935
105922 105923 105923 105951 105927 105923 105923 105923 105922 105923 105923 105923 105933 105932 105933
105923 105923 105923 105923 105923 105948 105949 105923 105923 105929 105932 105924 105927 105931 105937
105923 105923 105923 105923 105922 105923 105949 105923 105923 105929 105929 105931 105931 105936 105934
105923 105923 105923 105923 105922 105923 105924 105923 105926 105929 105929 105930 105926 105937 105934
105923 105923 105923 105923 105923 105923 105923 105923 105923 105924 105923 105923 105933 105937 105934
105923 105923 105923 105923 105922 105923 105923 105923 105923 105929 105929 105927 105932 105934 105935
105923 105955 105927 105923 105923 105923 105923 105923 105923 105925 105929 105927 105934 105935 105935
105954 105955 105923 105932 105927 105923 105924 105923 105923 105925 105929 105924 105935 105936 105933
105923 105923 105923 105923 105923 105923 105923 105923 105922 105925 105923 105923 105934 105935 105935
105923 105923 105929 105923 105923 105923 105923 105923 105923 105925 105923 105923 105934 105937 105933
105922 105923 105923 105923 105923 105923 105923 105923 105923 105925 105923 105923 105932 105936 105933
105923 105923 105923 105923 105922 105949 105923 105923 105923 105925 105923 105924 105935 105936 105933
105923 105922 105923 105923 105923 105923 105923 105923 105923 105925 105923 105924 105934 105937 105935

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 105948 bytes 100%
1,000 105935 bytes -13 bytes 100%
10,000 105922 bytes -13 bytes 100%
100,000 105922 bytes 4.64%
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
105975 bytes +53 bytes (+0.05%) +11 bytes
105972 bytes +50 bytes (+0.05%) +8 bytes
106007 bytes +85 bytes (+0.08%) +43 bytes
105964 bytes +42 bytes (+0.04%)
106035 bytes +113 bytes (+0.11%) +71 bytes
106065 bytes +143 bytes (+0.14%) +101 bytes
106111 bytes +189 bytes (+0.18%) +147 bytes
106156 bytes +234 bytes (+0.22%) +192 bytes
106206 bytes +284 bytes (+0.27%) +242 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 72906 bytes -33016 bytes (-31.17%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 77834 bytes -28088 bytes (-26.52%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 83538 bytes -22384 bytes (-21.13%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 88733 bytes -17189 bytes (-16.23%)
Brotli (Wikipedia) brotli brotli -q 11 92837 bytes -13085 bytes (-12.35%)
LZMA2 (Wikipedia) xz xz -9 94896 bytes -11026 bytes (-10.41%)
Zstandard (Wikipedia) zstd zstd -19 97529 bytes -8393 bytes (-7.92%)

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