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, direct link
cdnjs
  112081 bytes (109.5k)
CDN, direct link
gzip -6 (default)
  110505 bytes (107.9k)
local copy
gzip -9
  110147 bytes (107.6k)
local copy
cdnhttps
  109948 bytes (107.4k)
CDN, direct link
7zip -mx=9 -tgzip
  106304 bytes (103.8k)
local copy
pigz -11 -n
  106172 bytes (103.7k)
local copy
libdeflate -12
  106086 bytes (103.6k)
local copy
kzip -s0 -rn -b1
  105960 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-2.8.3.min.js

You will automatically get the smallest Ember 2.8.3 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 4026 bytes by using my Ember 2.8.3 Zopfli version instead of the best available CDN (3.80% smaller than cdnhttps, 105922 vs. 109948 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 --mls2048 --bsr6 --lazy --ohh

(found November 9, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
block splitting recursion 6  --bsr6
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 http://builds.emberjs.com/tags/v2.8.3/ember.min.js --location | md5sum
c63e08ec301ee2f5b3824a00b4895cbe  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.8.3.min.zopfli.js.gz | md5sum
c63e08ec301ee2f5b3824a00b4895cbe  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.8.3/ember.min.js --location | sha1sum
3065ceedfa6dc4aaf9b08cad37ebad25ce36378f  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.8.3.min.zopfli.js.gz | sha1sum
3065ceedfa6dc4aaf9b08cad37ebad25ce36378f  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 136675 bytes c63e08ec301ee2f5b3824a00b4895cbe November 4, 2016 @ 12:58
cdnjs 112081 bytes c63e08ec301ee2f5b3824a00b4895cbe November 2, 2016 @ 15:47
cdnhttps 109948 bytes c63e08ec301ee2f5b3824a00b4895cbe 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:

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 --i100000 --mls2048 --bsr6 --lazy --ohh November 9, 2016 @ 14:48
105923 bytes -12 bytes zopfli --i10000 --mls8 --bsr23 --lazy --ohh November 8, 2016 @ 20:32
105935 bytes -1 byte zopfli --i1000 --mls4 --bsr7 --lazy --ohh November 8, 2016 @ 19:52
105936 bytes -12 bytes zopfli --i1000 --mls16 --bsr23 --lazy --ohh November 8, 2016 @ 19:50
105948 bytes zopfli --i100 --mls16 --bsr6 --lazy --ohh November 8, 2016 @ 19:35

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 @ 15:28.

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 105923 105987 105934 105986 105930 105929 105942 105934 105930 105930 105929 105935 105926 105935
105930 105930 105930 105925 105924 105924 105929 105923 105923 105928 105929 105923 105936 105935 105934
105923 105923 105923 105923 105924 105924 105923 105923 105923 105925 105922 105924 105937 105933 105936
105924 105923 105923 105923 105923 105923 105923 105923 105923 105930 105929 105924 105935 105932 105933
105929 105928 105928 105926 105934 105930 105948 105930 105924 105924 105923 105924 105934 105932 105933
105925 105923 105923 105923 105923 105923 105923 105923 105924 105924 105924 105948 105934 105933 105932
105928 105929 105923 105923 105929 105923 105923 105923 105923 105925 105924 105923 105934 105933 105935
105924 105923 105932 105924 105923 105923 105923 105923 105923 105925 105924 105923 105936 105932 105935
105925 105923 105923 105923 105923 105923 105923 105923 105924 105924 105923 105948 105935 105937 105935
105925 105923 105924 105929 105923 105922 105923 105923 105923 105924 105923 105924 105934 105933 105935
105925 105923 105923 105933 105929 105923 105923 105923 105923 105923 105923 105924 105935 105932 105933
105923 105923 105923 105923 105923 105923 105948 105923 105923 105930 105932 105924 105936 105931 105937
105923 105924 105923 105923 105923 105923 105948 105923 105924 105930 105930 105931 105932 105936 105934
105924 105923 105932 105924 105923 105923 105925 105923 105926 105929 105929 105930 105927 105934 105934
105923 105924 105923 105923 105923 105923 105923 105923 105923 105924 105923 105924 105935 105932 105934
105924 105923 105923 105923 105923 105923 105923 105923 105924 105930 105930 105926 105932 105934 105935
105923 105955 105954 105923 105923 105923 105924 105923 105924 105924 105930 105928 105934 105936 105935
105928 105955 105923 105933 105929 105923 105924 105923 105924 105925 105929 105923 105937 105933 105934
105923 105923 105923 105923 105923 105923 105923 105923 105923 105925 105923 105948 105935 105933 105935
105923 105923 105923 105923 105923 105923 105924 105923 105923 105925 105923 105923 105935 105938 105933
105925 105923 105923 105923 105923 105923 105923 105923 105923 105924 105924 105948 105935 105933 105934
105924 105923 105924 105923 105923 105924 105923 105923 105923 105924 105923 105924 105937 105932 105933
105923 105923 105924 105951 105923 105923 105923 105923 105924 105925 105924 105925 105936 105932 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 105923 bytes -12 bytes 100%
100,000 105922 bytes -1 byte 43.19%
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
105972 bytes +50 bytes (+0.05%) +12 bytes
105960 bytes +38 bytes (+0.04%)
106008 bytes +86 bytes (+0.08%) +48 bytes
105971 bytes +49 bytes (+0.05%) +11 bytes
106028 bytes +106 bytes (+0.10%) +68 bytes
106066 bytes +144 bytes (+0.14%) +106 bytes
106108 bytes +186 bytes (+0.18%) +148 bytes
106155 bytes +233 bytes (+0.22%) +195 bytes
106192 bytes +270 bytes (+0.25%) +232 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 72906 bytes -33016 bytes (-31.17%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 77835 bytes -28087 bytes (-26.52%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 83539 bytes -22383 bytes (-21.13%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 88723 bytes -17199 bytes (-16.24%)
Brotli (Wikipedia) brotli brotli -q 11 92825 bytes -13097 bytes (-12.36%)
LZMA2 (Wikipedia) xz xz -9 94892 bytes -11030 bytes (-10.41%)
ZSTD (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 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